a (A˚ ) b (A˚ ) c (A˚ ) Pmnb P21/n Pmnb P21/n Pmn21 6.2726(3) 8.2735(1) 6.3079(2) 6.3363(1) 6.3040(2) 10.6582(2) 5.0060(2) 10.7548(3)10.8940(4) 5.3810(3) 4.9997(3) 8.2677(2) 5.0067(3) 5.0647(3) 4.9652(3) bu 98.82(4) 91.02(4) Rwp/S Poly. 24.4/1.23 ...