label: 6 alpha,7 alpha-difluoromethylene-4',5'-dihydro-1 alpha,2 alpha-methylene-(17R)spiro(androst-4-ene-17,2'(3'H)-furan)-3-one
label_lc: 6 alpha,7 alpha-difluoromethylene-4',5'-dihydro-1 alpha,2 alpha-methylene-(17r)spiro(androst-4-ene-17,2'(3'h)-furan)-3-one