Experiments were carried out at 100 K with Mo Kα radiation using a Bruker D8 Venture diffractometer. Absorption was corrected for by multi-scan methods (SADABS; Bruker, 2016 ▸), except for (IIa) and (IIe), where TWINABS (Bruker, 2012) was used.

	(Ic)	(Id)	(Ie)
Crystal data
Chemical formula	C24H21NO4	C25H24N2O3	C22H18N2O3
M r	387.42	400.46	358.38
Crystal system, space group	Monoclinic, C2/c	Triclinic, P	Triclinic, P
a, b, c (Å)	18.7572 (14), 13.2095 (10), 16.750 (2)	9.1028 (8), 10.6434 (9), 11.2539 (10)	7.8838 (5), 10.1766 (8), 11.8719 (9)
α, β, γ (°)	90, 105.374 (5), 90	88.988 (3), 68.422 (3), 81.352 (3)	87.554 (3), 75.996 (2), 69.428 (2)
V (Å3)	4001.7 (6)	1001.55 (15)	864.30 (11)
Z	8	2	2
μ (mm−1)	0.09	0.09	0.09
Crystal size (mm)	0.14 × 0.13 × 0.10	0.23 × 0.19 × 0.16	0.25 × 0.16 × 0.06
Data collection
T min, T max	0.908, 0.991	0.946, 0.986	0.949, 0.994
No. of measured, independent and observed [I > 2σ(I)] reflections	18506, 4768, 3469	41110, 4590, 4033	55488, 4333, 3760
R int	0.051	0.037	0.045
(sin θ/λ)max (Å−1)	0.659	0.650	0.670
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.047, 0.110, 1.02	0.038, 0.098, 1.05	0.038, 0.101, 1.07
No. of reflections	4768	4590	4333
No. of parameters	266	276	247
No. of restraints	0	0	0
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement	H atoms treated by a mixture of independent and constrained refinement	H atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å−3)	0.30, −0.26	0.30, −0.22	0.41, −0.22