Erythromycins showing an extremely relieved bitterness at administration and an improved absorbability in vivo when orally administered are provided. A compound having a group represented by the following formula: --O--CO--O--[(CH.sub.2).sub.m --O].sub.n --R (wherein R represents an alkyl group having from 1 to 12 carbon atoms, m represents an integer of from 2 to 4, and n represents an integer of from 1 to 7) at the 2'-position of erythromycins or a salt thereof.
提供了口服给药时在体内表现出极大的缓解苦味和改善的吸收性的
红霉素类化合物。该化合物在
红霉素类化合物的2'-位置或其盐中具有以下式代表的基团:--O--CO--O--[(CH.sub.2).sub.m --O].sub.n --R(其中R代表具有1至12个碳原子的烷基基团,m代表2至4的整数,n代表1至7的整数)。