The two varieties of the title compound, A = C 28 H33N0 6 , and B = C 3 iH3 9 N0 6 , crystallize in the triclinic system space group P\ with α = 10.605(9)Â, è = 11.85(l)A, c = 12.19(l)Â, oc = 109.2(9)°, /?=113.7(1)°, 7 = 89.35(9)° for the former and a = 10.273(l)Â, b = 11.561(8)Â, c = 12.605(8) À, <* = 101.65(8)°, β = 96.09(7)°, 7 = 92.82(7)°. Both structures have been determined using direct methods and refined to conventional R factors of 0.050 (A) and 0.054 (B) for 4712 and 5102 reflections, respectively. Both chair-chair and boat-chair conformations can exist. The drastic sterical effects of the substituent brought by the nitrogen atom have been emphasized.