화합물 31 LC / MS D : 100 % 순도 , UV = 214 nm , Rt = 1 . 290 분 , ESI 361 . 0 ( M + H ) +. 1 H NMR ( 400 MHz , DMSO - d 6 ) δ 8 . 18 ( 1 H , HCOOH ) , 7 . 98 - 7 . 95 ( m , 1 H ) , 7 . 04 ( d , J = 7 . 2 Hz , 1 H ) , 6 . 41 ( s , 1 H ) , 6 . 24 ( d , J = 7 . 6 Hz , 1 H ) , 4 . 12 - 4 . 07 ( m , 1 H ) , 3 . 78 - 3 . 74 ( m , 1 H ) , 3 . 33 - 3 . 24 ( m , 5 H ) , 2 . 62 - 2 . 53 ( m , 6 H ) , 2 . 32 - 2 . 29 ( m , 2 H ) , 1 . 90 - 1 . 87 ( m , 1 H ) , 1 . 77 - 1 . 72 ( m , 3 H ) .