(4S)-4β,5β-Dimethyl-1,3-dioxolane-2-one;4α,5α-Dimethyl-1,3-dioxolan-2-one;Carbonic acid (2R,3S)-2,3-butanediyl;(4S,5S)-4,5-Dimethyl-1,3-dioxolan-2-one
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