Synonyms: 2H,11H-Naphtho[2,1-b]pyrano[3,4-e]pyran-11-one,6-(acetyloxy)-1,3,4,4a,5,6,6a,12,12a,12b-decahydro-12-hydroxy-4,6a,12b-trimethyl-3-(1-oxopropoxy)-4-[(1-oxopropoxy)methyl]-9-(3-pyridinyl)-,[3S-(3a,4b,4ab,6a,6aa,12a,12ab,12ba)]-; (+)-Pyripyropene K; Pyripyropene K