Abstract C 19 H 27 N 3 O 4 , monoclinic, P 2 1 (no. 4), a = 9.9581(11) Å, b = 9.3987(9) Å, c = 11.6076(14) Å, β = 111.355(4)°, V = 1011.80(19) Å 3 , Z = 2, R gt ( F ) = 0.0604, w R ref ( F 2 ) = 0.1332, T = 302 K.
Liu et al. (Fri,) studied this question.