label: (4S,5S)-dihydro-5-((1R,2S)-2-hydroxy-2-methyl-5-oxo-3-cyclopenten-1-yl)-3-methylene-4-(3-oxobutyl)-2(3H)-furanone
label_lc: (4s,5s)-dihydro-5-((1r,2s)-2-hydroxy-2-methyl-5-oxo-3-cyclopenten-1-yl)-3-methylene-4-(3-oxobutyl)-2(3h)-furanone