seen framstella 18 - methyl - 19 - nor - 20 - keto pregnaner

摘要

18-Methyl-19-nor-20-keto steroids of the formula IMAGE wherein R1 and R2 collectively are an oxygen atom, or each is hydrogen, or one of R1 and R2 is hydrogen and the other is hydroxy, and R3 is a ketonic oxygen atom or two hydrogen atoms, possess CNS-depressant activity, especially anesthetic-narcotic activity.