IUPAC definition : Cyclic esters of hydroxy carboxylic acids, containing a 1-oxacycloalkan-2-one structure,
or analogues having unsaturation or heteroatoms replacing one or more carbon atoms
of the ring.;
Cyclic esters of hydroxy carboxylic acids, containing a 1-oxacycloalkan-2-one structure,
or analogues having unsaturation or heteroatoms replacing one or more carbon atoms
of the ring.