C21H30BN2O2.50, trigonal, R3 (no. 146), a = 26.759(5) angstrom, c = 7.431(2) angstrom, V = 4608.1 angstrom(3), Z = 9, R-gt(F) = 0.041, wR(ref)(F-2) = 0.094, T = 300 K. C21H28BN2O2.50, trigonal, R3 (no. 146), a = 26.465(6) c = 7.375(2) angstrom, V = 4473.5 angstrom(3), Z = 9, R-gt(F) = 0.039, wR(ref)(F-2) = 0.062, T = 300 K.
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