摘要:
The present invention relates to morphinan derivatives and preparation methods thereof, especially to ketal hydroxyl protected compounds of morphinan derivatives and preparation method thereof, and to a method for preparing corresponding alkylated morphinan derivatives by using the ketal hydroxyl protected compounds as intermediates, and more especially to a ketal hydroxyl protected compound of methylnaltrexone as intermediate for preparing methylnaltrexone and a method for preparing methylnaltrexone through said intermediate.
摘要:
The present invention relates to morphinan derivatives and preparation methods thereof, especially to ketal hydroxyl protected compounds of morphinan derivatives and preparation method thereof, and to a method for preparing corresponding alkylated morphinan derivatives by using the ketal hydroxyl protected compounds as intermediates, and more especially to a ketal hydroxyl protected compound of methylnaltrexone as intermediate for preparing methylnaltrexone and a method for preparing methylnaltrexone through said intermediate.
摘要:
A febuxostat which purity is not less than 99.0%, method for preparation thereof, and pharmaceutical composition thereof. The method for preparation includes recrystallizing febuxostat in a mixed solvent. The said pharmaceutical composition can be used in manufacture of medicaments for treating diseases associated with hyperuricemia.
摘要:
A method of purifying a salt of pemetrexed having a structure of formula (III) by salting-out, wherein if M3+ is H+, then each of M1+ and M2+ is independently H+, Li+, Na+ or K+, provided that both of them are not H+; if M3+ is Li+, Na+ or K+, then each of M1+ and M2+ is independently Li+, Na+ or K+.
摘要:
A method of purifying a salt of pemetrexed have a structure of formula (III) by salting-out, wherein if M3+ is H+, then each of M1+ and M2+ is independently H+, Li+, Na+ or K+, provided that both of them are not H+; if M3+ is Li+, Na+ or K+, then each of M1+ and M2+ is independently Li+, Na+ or K+.
摘要:
Three new crystalline forms of pemetrexed diacid, preparation methods and uses thereof are disclosed. These preparation processes are simple and have better practicality.
摘要:
Three new crystalline forms of pemetrexed diacid, preparation methods and uses thereof are disclosed. These preparation processes are simple and have better practicality.
摘要:
A method and apparatus for use in improving linearity sensitivity of MOSFET devices having an accumulated charge sink (ACS) are disclosed. The method and apparatus are adapted to address degradation in second- and third-order intermodulation harmonic distortion at a desired range of operating voltage in devices employing an accumulated charge sink.
摘要:
The present invention provides a stable composition of rasagiline comprising an effective dosage of rasagiline or its pharmaceutically acceptable salts and an antioxidant used as a stabilizer. The dosage forms of the composition are pharmaceutically common transdermal-drug delivery dosage form and mucoadhesive delivery dosage form, such as patch, gel, ointment, cream, cataplasm, film, spray and solution, etc. The composition can be used to prevent or treat mental disorders.
摘要:
A system, method and computer program product for implementing a quiescent current leakage specific model into semiconductor device design and circuit design flows. The leakage model covers all device geometries with wide temperature and voltage ranges and, without the need for stacking factor calculations nor spread sheet based IDDQ calculations. The leakage model for IDDQ calculation incorporates further parasitic and proximity effects. The leakage model implements leakage calculations at different levels of testing, e.g., from a single device to a full chip design, and are integrated within one single model. The leakage model implements leakage calculations at different levels of testing with the leverage of a single switch setting. The implementation is via a hardware definition language code or object oriented code that can be compiled and operated using a netlist of interest, e.g., for conducting a performance analysis.