Synonyms: Butanoicacid, 3-methyl-,6-(acetyloxy)-6,7a-dihydro-4-[(3-methyl-1-oxobutoxy)methyl]spiro[cyclopenta[c]pyran-7(1H),2'-oxiran]-1-ylester, [1S-(1a,6a,7b,7aa)]-; Spiro[cyclopenta[c]pyran-7(1H),2'-oxirane], butanoic acid deriv.;Isovaltrate; Isovaltratum