Fig. 1

Dioxolanones identified. Metguignardic acid (1), guignardianone C (2), ethyl guignardate (3), guignardianone D (4) and the methyl ester of phenguignardic acid (5).
Dioxolanones identified. Metguignardic acid (1), guignardianone C (2), ethyl guignardate (3), guignardianone D (4) and the methyl ester of phenguignardic acid (5).