2-Propenoic acid, 3-(methylthio)-, (1R,2R,8aR)-1,2,3,4,6,8a- hexahydro-7-(1-hydroxy-1-methylethyl)-1,8a-dimethyl-6-oxo-2-naphthalenyl ester, (2Z)- 211691-00-8 NSC710194 S-Petasitin