Synonyms: 1H-4,9a-Ethanocyclohepta[c]pyran-7-carboxylicacid,4a-(acetyloxy)-3-(4-carboxy-1,3-pentadienyl)-3,4,4a,5,6,9-hexahydro-3-methyl-1-oxo-,7-methyl ester, [3R-[3a(1E,3E),4a,4aa,9aa]]-; 1H-4,9a-Ethanocyclohepta[c]pyran-7-carboxylicacid, 4a-(acetyloxy)-3-[(1E,3E)-4-carboxy-1,3-pentadienyl]-3,4,4a,5,6,9-hexahydro-3-methyl-1-oxo-,7-methyl ester, (3R,4S,4aS,9aR)- (9CI); (-)-Pseudolaric acid B; NSC 615488;O-Acetylpseudolaric acid C; Pseudolaric acid B; Pseudolarix acid B