secondary carboxamide tertiary carboxamide macrolide antibiotic secondary alcohol sulfone cyclic ketone dalfopristin A macrolide that is pristinamycin IIA in which the double bond between positions 26 and 26a of the pyrroline ring has been reduced and position 26<i>R</i> carries a [2-(diethylamino)ethyl]sulfonyl group. It is a semi-synthetic streptogramin antibiotic and often used as a mixture with quinupristin for the treatment of vancomycin-resistant <em>Enterococcus faecium</em>. CHEBI:42127 1,3-oxazoles tertiary amino compound enamide