ANTIMYCIN A2

3-[3-formamidosalicylamido]-8-hexyl-2,6-dimethyl-4,9-dioxo-1,5-dioxonan-7-yl butyrate

Butyric acid 3-[(3-formylamino-2-hydroxybenzoyl)amino]-8-hexyl-2,6-dimethyl-4,9-dioxo-1,5-dioxonan-7-yl ester