Table 2. A comparison of various dihedral angles (°) for I and TAYLUB01 ^a , and for II and KELZIL ^b and KEQXOU ^c .

A = ring N1/N2/C1–C3, B = ring C4–C9, C = ring C13–C18 (atom numbering following this paper).

Dihedral angle	I	TAYLUB01 a	II	KELZIL b	KEQXOU c
Planes A to B	54.87 (7)	55.01 (7)	60.44 (8)	51.6 (1)	50.8 (2)
Planes A to C	22.92 (7)	19.03 (7)	12.70 (9)	8.7 (1)	9.1 (2)
Planes B to C	73.98 (6)	73.98 (6)	71.28 (8)	59.0 (1)	59.1 (2)

Notes: (a) Asiri et al. (2010 ▸); (b) Sun et al. 2006 ▸); (c) Yan et al. 2006 ▸).