polygodial [ 1,4,4a,5,6,7,8,8a-octahydro-5,5,8a-trimethyl-1,2-naphthalenedicarboxaldehyde,epipolygodial ] isolated from leaves of New Zealand tree Pseudowintera colorata; possesses stong antifungal activity against Candida albicans; also isolated from sea slug Dendrodoris limbata