Table 2. Experimental details.

Crystal data
Chemical formula	C20H19N3O3
M r	349.38
Crystal system, space group	Monoclinic, P21/c
Temperature (K)	296
a, b, c (Å)	18.451 (5), 8.169 (5), 11.591 (5)
β (°)	100.059 (5)
V (Å3)	1720.2 (14)
Z	4
Radiation type	Mo Kα
μ (mm−1)	0.09
Crystal size (mm)	0.30 × 0.25 × 0.20
Data collection
Diffractometer	Bruker APEXII CCD area detector
Absorption correction	Multi-scan (SADABS; Bruker, 2003 ▸)
T min, T max	0.281, 0.397
No. of measured, independent and observed [I > 2σ(I)] reflections	12516, 3381, 2169
R int	0.056
(sin θ/λ)max (Å−1)	0.617
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.045, 0.100, 1.02
No. of reflections	3381
No. of parameters	238
H-atom treatment	H-atom parameters constrained
Δρmax, Δρmin (e Å−3)	0.23, −0.19

Computer programs: APEX2 and SAINT (Bruker, 2003 ▸), SHELXS2018 (Sheldrick, 2008 ▸), PLATON (Spek, 2009 ▸), SHELXL2018 (Sheldrick, 2015 ▸), Mercury (Macrae et al., 2008 ▸), PLATON (Spek, 2009 ▸) and publCIF (Westrip, 2010 ▸).