Spiro[estr-4-ene-17,2'(3'H)-furan]-3-one,4',5'-dihydro-, (17R)- (8CI); Spiro[17H-cyclopenta[a]phenanthrene-17,2'(3'H)-furan],spiro[estr-4-ene-17,2'(3'H)-furan]-3-one deriv.; 19-Nor-20-spirox-4-en-3-one;19-Norspiroxenone; Compound B19; L 586.153
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