1,2-dihydro-3H-pyrido[3,2,1-kl]phenothiazin-3-one 7,7-dioxide 3H-pyrido[3,2,1-kl]phenothiazin-3-one, 1,2-dihydro-, 7,7-dioxide InChI=1/C15H11NO3S/c17-12-8-9-16-11-5-1-2-6-13(11)20(18,19)14-7-3-4-10(12)15(14)16/h1-7H,8-9H