U.S. Department of Health & Human Services Divider Arrow National Institutes of Health Divider Arrow NCATS

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Showing 2661 - 2670 of 4697 results

Status:
Other

Class (Stereo):
CHEMICAL (ACHIRAL)

Status:
Other

Class (Stereo):
CHEMICAL (ABSOLUTE)

Status:
Other

Class (Stereo):
CHEMICAL (ACHIRAL)

Catharanthine is a terpene indole alkaloid produced by the medicinal plant Catharanthus roseus. Catharanthine is derived from strictosidine, but the exact mechanism by which this happens is currently unknown. Catharanthine is one of the two precursors that form vinblastine, the other being vindoline.
Status:
Other

Class (Stereo):
CHEMICAL (ACHIRAL)

Status:
Other

Class (Stereo):
CHEMICAL (ACHIRAL)

Status:
Other

Class (Stereo):
CHEMICAL (ACHIRAL)

Status:
Other

Class (Stereo):
CHEMICAL (ACHIRAL)



RS-127445 is a selective; high affinity; orally bioavailable serotonin 5-HT2B receptor antagonist. RS-127445 was found to have a nanomolar affinity for the 5-HT2B receptor (pKi = 9.5 /-0.1) and 1,000 fold selectivity for this receptor as compared to numerous other receptors and ion channel binding sites. RS-127445 potently antagonized 5-HT-evoked formation of inositol phosphates (pK(B) = 9.5 /-0.1) and 5-HT-evoked increases in intracellular calcium (pIC50 = 10.4 /-0.1). RS-127445 also blocked 5-HT-evoked contraction of rat isolated stomach fundus (pA2 = 9.5 /-1.1) and ( /-)alpha-methyl-5-HT-mediated relaxation of the rat jugular vein (pA2 = 9.9 /-0.3). RS-127445 (MT-500) was being developed for the prophylactic treatment of migraine. POZEN acquired MT-500 from Roche in November 1999 and assumed full responsibility for its development for migraine prophylaxis.

Showing 2661 - 2670 of 4697 results