preferred_name: (S)-4,5-dihydroxypentane-2,3-dione <=> (2R,4S)-2-methyl-2,4-dihydroxydihydrofuran-3-one
preferred_name_lc: (s)-4,5-dihydroxypentane-2,3-dione <=> (2r,4s)-2-methyl-2,4-dihydroxydihydrofuran-3-one
label: (S)-4,5-dihydroxypentane-2,3-dione <=> (2R,4S)-2-methyl-2,4-dihydroxydihydrofuran-3-one
label_lc: (s)-4,5-dihydroxypentane-2,3-dione <=> (2r,4s)-2-methyl-2,4-dihydroxydihydrofuran-3-one