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C 21 H 22 N 2 O 4 , monoclinic,  P 2 1 / n  (no. 14),  a  = 8.1261(14) Å,  b  = 11.829(2) Å,  c  = 20.123(4) Å,  β  = 98.002(3)°,  V  = 1915.4(6) Å 3 ,  Z  = 4,  R  gt ( F ) = 0.0394,  wR  ref ( F  2 ) = 0.1043,  T  = 296(2) K.

Crystal structure of ethyl 2-amino-4-(3-cyanophenyl)-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydro-4 H -chromene-3-carboxylate, C 21 H 22 N 2 O 4