2H-indol-2-one, 1,3-dihydro-3-(3-methyl-2-butenyl)- 3-(3-methylbut-2-en-1-yl)-1,3-dihydro-2H-indol-2-one InChI=1/C13H15NO/c1-9(2)7-8-11-10-5-3-4-6-12(10)14-13(11)15/h3-7,11H,8H2,1-2H3,(H,14,15