(3R,4R)-3-acyl-4-(hydroxymethyl)oxolan-2-one
(3r,4r)-3-acyl-4-(hydroxymethyl)oxolan-2-one
A butan-4-olide carrying acyl and hydroxymethyl substituents at positions 3 and 4 respectively and having 3<i>R</i>,4<i>R</i>-configuration.