TLC ( ethyl acetate / n - hexane = 1 : 3 ) Rf = 0 . 26 , mp : 244 - 246 ℃, HPLC purity : 99 . 6 %; ESI LC / MS : m / z calcd for C 24 H 18 NO 2 [ MH ] + 352 . 13 ; found 352 . 29 . 1 H NMR ( 250 MHz , DMSO - d 6 ) δ 9 . 69 ( s , 1 H , indenopyridine 9 - OH ) , 9 . 57 ( s , 1 H , 4 - phenyl 3 - OH ) , 8 . 20 - 8 . 17 ( d , J = 7 . 13 Hz , 2 H , 2 - phenyl H - 2 , H - 6 ) , 7 . 85 ( s , 1 H , indenopyridine H - 3 ) , 7 . 57 - 7 . 44 ( m , 3 H , 2 - phenyl H - 3 , H - 4 , H - 5 ) , 7 . 40 - 7 . 28 ( m , 3 H , indenopyridine H - 7 , 4 - phenyl H - 4 , H - 5 ) , 7 . 23 ( s , 1 H , 4 - phenyl H - 2 ) , 7 . 15 ( d , J = 7 . 43 Hz , 1 H , indenopyridine H - 6 ) , 6 . 92 - 6 . 89 ( m , 2 H , 4 - phenyl H - 4 , indenopyridine H - 8 ) , 4 . 13 ( s , 2 H , indenopyridine H - 5 ) . 13 C NMR ( 62 . 5 MHz , DMSO - d 6 ) δ 161 . 41 , 157 . 95 , 155 . 17 , 154 . 04 , 146 . 30 , 145 . 47 , 139 . 04 , 138 . 41 , 132 . 22 , 130 . 78 , 130 . 18 , 129 . 34 , 129 . 08 ( 2 C ) , 126 . 90 ( 2 C ) , 124 . 94 , 119 . 29 , 116 . 98 , 116 . 86 , 116 . 12 , 115 . 37 , 113 . 37 , 34 . 78 .