4-cyclopentylidene-3-methylisoxazol-5(4H)-one 5(4H)-isoxazolone, 4-cyclopentylidene-3-methyl- InChI=1/C9H11NO2/c1-6-8(9(11)12-10-6)7-4-2-3-5-7/h2-5H2,1H