摘要:
A compound of the formula: ##STR1## wherein, R.sup.1 and R.sup.2 are the same or different/representing methyl or methoxy groups, or form --CH.dbd.CH--CH.dbd.CH-- by binding to each other; R.sup.3 is an aromatic group or a heterocyclic group which may be substituted; and n is an integer of 2 to 8, shows inhibitory effect of cell proliferation and is useful as cell proliferation inhibitor.
摘要:
New compounds of the formula ##STR1## (wherein R.sub.1 represents a lower alkyl group: and ##STR2## represents an alkylidene radical in which at least one of R.sub.2 and R.sub.3 is a lower alkyl which may optionally be substituted by phenyl, phenyl or a 5- or 6-membered aromatic ring including S, N or O, and the remainder, if any, is hydrogen; ora cycloalkylidene radical of up to six carbon atoms, to which a benzene ring may optionally be fused).These compounds are produced by reacting the corresponding 6-acyloxy compounds with a compound of the formula ##STR3## The new compounds have antiviral activity and are useful to prolong the life spans of tumor-bearing animals.
摘要:
An optical information recording/reproducing optical system where resin material has Tg>115° C., first, second and third films are on an optical disc side of an objective lens and surfaces of an optical element, respectively, a light source side of the objective lens has a fourth film having four or more layers not containing Ti, each of the first, second and third films includes a non-high refractive index layer made of one of silicon oxide, aluminum oxide, aluminum fluoride and magnesium fluoride or a mixture of at least two of them, each of the first, second and third films is not made of one of Ti, Ta, Hf, Zr, Nb, Mo and Cr, a layer of the fourth film closest to a base material is the non-high refractive index layer. The fourth film satisfies 350
摘要:
This invention relates to 9-thiomaytansinoid compounds represented by the formula ##STR1## wherein R is hydrogen or acyl derived from a carboxylic acid, X is chlorine or hydrogen, Y is hydrogen, lower alkylsulfonyl, or alkyl or aralkyl which are unsubstituted or substituted, and methods of producing the same. The compounds are useful as antitumor, antiprotozoal and antifungal agents.
摘要:
New derivatives of the formula: ##STR1## (wherein X is O or NH; R.sub.1 is --OH which may optionally be etherified or esterified, etherified mercapto or --NH.sub.2 which may optionally be substituted; R.sub.2 and R.sub.3, respectively, mean H, lower alkyl or ##STR2## and Y is an esterified or amidated carboxyl group, or CN). These derivatives are produced, by fluorination of corresponding 1,2,3,4-tetrahydro-2,4-dioxopyrimidine compounds and can be converted into 5-fluorouracil derivatives under hydrolytic conditions. The new derivatives are able to prolong the lives of animals having carcinomas or have antiviral activity.
摘要翻译:式中的新衍生物:其中X为O或NH; R 1为-OH,其可任选被醚化或酯化,醚化巯基或可任选被取代的-NH 2; R 2和R 3分别表示H,低级 烷基或,Y是酯化或酰胺化的羧基,或CN)。 这些衍生物通过相应的1,2,3,4-四氢-2,4-二氧嘧啶化合物的氟化生产,并且可以在水解条件下转化为5-氟尿嘧啶衍生物。 新的衍生物能够延长具有癌症或具有抗病毒活性的动物的生命。
摘要:
Maytansinoid compounds are produced by(a) treating a compound of the formula ##STR1## wherein alk is ##STR2## --CH.sub.2 CH.sub.2 CH.sub.3 or ##STR3## under conditions of reductive hydrolysis to yield maytinsinol; and (b) contacting the maytansinol with an acid of the formula ##STR4## wherein R is lower alkyl, in the presence of a carbodiimide to yield a maytansinoid.In accordance with a second aspect of the invention there is provided a D-form maytansinoid with respect to the asymmetric center at the 2'-position having the formula: ##STR5## wherein R is a lower alkyl group.
摘要:
Maleonitrile is obtained as a dominant product of the reaction between cyanoacetylene and hydrogen cyanide. The yield of maleonitrile is remarkably higher than that in any of known processes.
摘要:
An optical information recording/reproducing optical system, comprising a light source; an optical element converting a laser beam into a substantially collimated beam; and an objective lens, wherein a wavelength λ (unit: nm) of the laser beam falls within a range of 400 115° C., each of optical surfaces is configured not to have an optical thin film which contains at least one of or elements of titanium, tantalum, hafnium, zirconium, niobium, molybdenum and chromium, each of optical surfaces of the optical element is provided with an antireflection film made of one of or a mixture of at least two of silicon oxide, aluminum oxide, aluminum fluoride and magnesium fluoride, and a following condition is satisfied ∏ i = 1 n - 1 ( 1 - R ( BL ) i 100 ) - ∏ i = 1 n - 1 ( 1 - R ( UV ) i 100 ) > 0.05 .
摘要:
An objective lens for an optical information recording/reproducing optical system for an optical disc letting a laser beam impinge on a recording layer of the optical disc, and wherein a center wavelength λ (unit: nm) of the laser beam is in a range defined by a condition: 390≦λ≦420, a base material of the objective lens is made of resin, the resin has a glass transition temperature Tg and light transmissivity T (unit: %) per a path length of 3 mm at a wavelength of 406 nm defined by conditions: Tg≧115° C., 85≦T≦90, same antireflection films or different types of antireflection films are respectively formed on optical surfaces of the objective lens, and each of the antireflection films formed on the objective lens has a thickness of 100 nm or more in a vicinity of an optical axis of the objective lens.
摘要:
An organic material production system includes: a pretreatment device (12) that pulverizes a biomass material (11); a hydrothermal decomposition apparatus (14) that hydrothermally decomposes a pulverized biomass (13) by causing it to countercurrently contact with hot compressed water (15), elutes lignin components and hemicellulose components into the hot compressed water (15), and separates the lignin components and the hemicellulose components from a biomass solid residue; a first enzymatic hydrolysis device (19-1) that treats cellulose in a biomass solid residue (17), discharged from the hydrothermal decomposition apparatus, with an enzyme (18) to enzymatically hydrolyze it to a sugar solution containing hexose; a fermenter (21) that produces ethanol by fermentation using a sugar solution (20) obtained by the first enzymatic hydrolysis device (19-1); and a refiner 25 that refines an alcohol fermentation liquid (22), so as to separate it into ethanol (23) and a residue (24).