Synonyms: 6Z-Pandamarilactonine B;(5R)-3-Methyl-5α-[(2S)-1-[4-[(2Z)-4-methyl-5-oxo-2,5-dihydrofuran-2-ylidene]butyl]-2α-pyrrolidinyl]-2,5-dihydrofuran-2-one;(5R)-5α-[(2S)-1-[4-[(2Z)-4-Methyl-5-oxo-2,5-dihydrofuran-2-ylidene]butyl]-2α-pyrrolidinyl]-3-methyl-2,5-dihydrofuran-2-one;(5R)-3-Methyl-5α-[(2S)-1-[(Z)-4-[4-methyl-5-oxo-2,5-dihydrofuran-2-ylidene]butyl]-2α-pyrrolidinyl]-2,5-dihydrofuran-2-one;(2S)-1-[4-[(5Z)-2,5-Dihydro-3-methyl-2-oxofuran-5-ylidene]butyl]-2-[(5R)-2,5-dihydro-3-methyl-2-oxofuran-5-yl]pyrrolidine;