2H-PYRAN-2-ONE, 4-METHOXY-6-METHYL- 4-Methoxy-6-methyl-2H-pyran-2-one 5-18-01-00110 (Beilstein Handbook Reference) 672-89-9 BRN 0115970 EINECS 211-600-9 Methyltriacetolacton [German] Methyltriacetolactone NSC 139216