2H-pyran-2-one, 6-[(1S)-1-hydroxypropyl]-4-methoxy-5-methyl- 6-(1-Hydroxy-propyl)-4-methoxy-5-methyl-pyran-2-one 6-(1-hydroxypropyl)-4-methoxy-5-methyl-2H-pyran-2-one Annularin A InChI=1/C10H14O4/c1-4-7(11)10-6(2)8(13-3)5-9(12)14-10/h5,7,11H,4H2,1-3H3/t7-/m0/s