17-Chloro-10-demethoxy-10-methylthiocolchicine 38479-08-2 Acetamide, 2-chloro-N-(5,6,7,9-tetrahydro-1,2,3-trimethoxy-10-(methylthio)-9-oxobenzo(a)heptalen-7-yl)-, (S)- BRN 2790213 NSC 261044