Watermelon Ketone , with CAS number of 28940-11-6, can be called 7-Methyl-3,4-dihydro-2H-1,5-benzodioxepin-3-one ; 2H-1,5-benzodioxepin-3(4H)-one, 7-methyl- ; 7-Methyl-2H-1,5-benzodioxepin-3(4H)-one .