1 9YE 4-(3-methylbut-2-enoxy)-5-propan-2-yl-7,8-dihydro-6~{H}-indeno[1,2-B]indole-9,10-dione 1.000 2 FXB 5-propan-2-yl-4-prop-2-enoxy-7,8-dihydro-6~{H}-indeno[1,2-B]indole-9,10-dione 0.926