Three new C-15-isobutyryl 16-norphragmalin-type limonoids from Chukrasia tabularis var. velutina

► Three new C-15-isobutyryl 16-norphragmalin limonoids were isolated. ► Compound 1 was distinguished by a unique ketonic isobutyryl substitution at C-15. ► Compounds 2 and 3 showed anti-inflammatory activity.