摘要:
Provided are a camptothecin compound containing 7-membered lactone ring, as shown in general formula I, and pharmaceutically acceptable salt thereof, as well as the preparation method and use thereof. In general formula I, R1 is H, a C1˜C3 alkyl, acetyl or propionyl; R2 is H, a C1˜C6 alkyl, a C3˜C6 cycloalkyl, piperidyl; or a C1˜C6 alkyl substituted by an amino; R3 is H, a C1˜C3 alkyl, or a C1˜C6 alkyl substituted by an amino; R4 is H, a hydroxyl, or a C1˜C6 alkoxy; R5 is H, or a C1˜C6 alkoxyl; or R4 and R5 are linked to each other to form —OCH2O— or —OCH2CH2O—. The compound has good anti-tumor activity, and can be clinically used via oral administration, intravenous injection, and intramuscular injection, among others.
摘要:
Provided are a camptothecin compound containing 7-membered lactone ring, as shown in general formula I, and pharmaceutically acceptable salt thereof, as well as the preparation method and use thereof. In general formula I, R1 is H, a C1˜C3 alkyl, acetyl or propionyl; R2 is H, a C1˜C6 alkyl, a C3˜C6 cycloalkyl, piperidyl; or a C1˜C6 alkyl substituted by an amino; R3 is H, a C1˜C3 alkyl, or a C1˜C6 alkyl substituted by an amino; R4 is H, a hydroxyl, or a C1˜C6 alkoxy; R5 is H, or a C1˜C6 alkoxyl; or R4 and R5 are linked to each other to form —OCH2O— or —OCH2CH2O—. The compound has good anti-tumor activity, and can be clinically used via oral administration, intravenous injection, and intramuscular injection, among others.
摘要:
Methods are disclosed for replenishing tin and its alloying metals in an aqueous electrolytic plating bath using an acidic solution containing stannous oxide. During electroplating of tin or tin alloys the stannous ions and alloying metal ions are depleted. To maintain continuous and efficient electroplating processes predetermined amounts of the plating bath containing tin and its alloying metals are bailed out. The bail out is then mixed with a predetermined amount of acidic solution containing stannous oxide and any alloying metals. The mixture is then retuned to the plating bath to return the stannous ions and alloying metal ions to their steady state concentrations.
摘要:
Tin-silver alloy electroplating baths having certain amine-oxide surfactants and methods of electrodepositing a tin-silver-containing layer using these baths are disclosed. Such electroplating baths are useful to provide tin-silver solder deposits having reduced void formation and improved within-die uniformity.
摘要:
An electrical connector includes a housing including a base portion and a tongue portion and contacts. The contacts include contacting plate at the tongue portion, leg portion extending from the rear and retaining portions retained in the base portion. The contacts includes a first group and second group, each group including ground contacts and signal contacts. The contacting plates of the first group are located along a first side face of the tongue portion, the contacting plate of the second group are located along an opposite second side face, the retaining portions of the first and second groups being spaced from each other. A one-piece grounding bar is retained in the base portion, the ground bar includes a beam portion hidden in the base portion and between said retaining portions of the first group and second groups, and fingers touch with corresponding retaining portions of ground contacts.
摘要:
sa An electrical connector includes an insulating housing defining an uninterrupted tongue portion with opposite first surface and second surface and a plurality of contacts loaded in the tongue portion. The contacts includes a first group of contacts with first contacting portions loaded in the first surface, a second group of contacts with second contacting portions loaded in the second surface. Each of the first and second group of contacts is composed of signal contacts and grounding contacts and a connecting bar is assembled to electrically connect at least one first grounding contact and one second grounding contact.
摘要:
A compression connector for mounting to a print circuit board includes an insulative housing and a plurality of terminals received in the housing. The housing includes a first mating surface and a second mating surface opposite to the first mating surface. A number of terminal passageways are disposed between and running through the first and second mating faces. Each terminal includes a retaining section. Each of terminal passageway defines a retaining slot along a height direction orienting from the first mating surface to the second mating surface to receive the retaining section of the terminal and two limited portions at two ends of the retaining slot in the height direction so as to allow the retaining section to move in the height direction without dropping out.
摘要:
Methods are disclosed for replenishing tin and its alloying metals in an aqueous electrolytic plating bath using an acidic solution containing stannous oxide. During electroplating of tin or tin alloys the stannous ions and alloying metal ions are depleted. To maintain continuous and efficient electroplating processes predetermined amounts of the plating bath containing tin and its alloying metals are bailed out. The bail out is then mixed with a predetermined amount of acidic solution containing stannous oxide and any alloying metals. The mixture is then retuned to the plating bath to return the stannous ions and alloying metal ions to their steady state concentrations.