Synonyms: 2H-Pyran-2-one,6-(2,4-dihydroxy-3,5-dimethyl-7-nonenyl)-5-ethyl-5,6-dihydro-, [5R-[5a,6a(2R*,3S*,4R*,5S*,7E)]]-; 2H-Pyran-2-one,6-[(2R,3S,4R,5S,7E)-2,4-dihydroxy-3,5-dimethyl-7-nonenyl]-5-ethyl-5,6-dihydro-,(5R,6R)- (9CI); (-)-NK 10958P; Antibiotic NK 10958P; Demethylpironetin; NK10958P