Unusual naphthoquinones, catechin and triterpene from Byrsonima microphylla

The new compounds, Δ1-lupenone (1), 3-hydroxy-2-methoxy-8,8,10-trimethyl-8H-antracen-1,4,5-trione (2), 3,7-dihydroxy-2-methoxy-8,8,10-trimethyl-7,8-dihydro-6H-antracen-1,4,5-trione (3), (2S*,10aR*)-2,8-dihydroxy-6-methoxy-1,1,7-trimethyl-2,3,10,10a-tetrahydro-1H-fenantren-9-one (4) and (2S,3S)-3′-hydroxy-4′,5,7-trimethoxy-flavan-3-ol (5) were isolated from the wood of Byrsonima microphylla (Malpighiaceae). The structures of these compounds were elucidated by chemical and spectroscopic analysis.