1H-indene-1,3(2H)-dione, 2-[4-[bis(2-chloroethyl)amino]phenyl]- 2-{4-[bis(2-chloroethyl)amino]phenyl}-1H-indene-1,3(2H)-dione InChI=1/C19H17Cl2NO2/c20-9-11-22(12-10-21)14-7-5-13(6-8-14)17-18(23)15-3-1-2-4-16(15)19(17)24/h1-8,17H,9-12H