IUPAC:(1'S,2R,2'R,3'S,6'R,11'S)-3'-ethyl-4-methyl-11'-[(2S,4S)-4-methyl-5-oxooxolan-2-yl]-5H-5'-oxa-10'-azaspiro[furan-2,4'-tricyclo[8.3.0.0^{2,6}]tridecan]-5-one
IUPAC:(1'S,2R,2'R,3'S,6'R,11'S)-3'-ethyl-4-methyl-11'-[(2S,4S)-4-methyl-5-oxooxolan-2-yl]-5H-5'-oxa-10'-azaspiro[furan-2,4'-tricyclo[8.3.0.0^{2,6}]tridecan]-5-one