Table 2. Conformations (Å, °) of the DHF rings for compound 1 .

DHF ring	r.m.s. deviation	Largest deviation	Angle between ring normals
C1–C4/O1	0.067	C4 −0.0936 (6)	—
C5–C8/O2	0.038	C8 −0.0521 (8)	82.18 (4) a
C9–C12/O3	0.034	C12 −0.0468 (7)	42.32 (4) a
C13–C16/O4	0.049	C16 −0.0679 (7)	45.01 (4) a
C17–C20/O5	0.054	C20 −0.0934 (6)	—
C21–C24/O6	0.050	C24 −0.0699 (7)	48.41 (6) b
C25–C28/O7	0.093	C28 0.1298 (9)	55.30 (6) b
C29–C32/O8	0.029	C32 −0.0397 (7)	81.77 (4) b

Notes: (a) compared to C1–C4/O1; (b) compared to C17–C20/O5.