34217-20-4 NSC146190 Phenanthro[1,2-b]oxirene-4-carboxylic acid, tetradecahydro-1b,9-dihydroxy-4,7a-dimethyl-9a-(1-methylethyl)-, methyl ester, [1aR-(1a.alpha.,1b.beta.,3a.beta.,4.beta.,7a.alpha.,7b.beta.,9.beta.,9a.alpha.)]-