Table 2. Experimental details.

Crystal data
Chemical formula	C5H4ClNOSe
M r	208.50
Crystal system, space group	Monoclinic, P21/c
Temperature (K)	100
a, b, c (Å)	3.9601 (8), 7.5102 (15), 22.350 (5)
β (°)	94.32 (3)
V (Å3)	662.8 (2)
Z	4
Radiation type	Synchrotron, λ = 0.96990 Å
μ (mm−1)	13.68
Crystal size (mm)	0.05 × 0.03 × 0.03
Data collection
Diffractometer	Rayonix SX-165 CCD
Absorption correction	Multi-scan (SCALA; Evans, 2006 ▸)
T min, T max	0.550, 0.660
No. of measured, independent and observed [I > 2σ(I)] reflections	5526, 1310, 1121
R int	0.083
(sin θ/λ)max (Å−1)	0.636
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.074, 0.175, 1.01
No. of reflections	1310
No. of parameters	83
H-atom treatment	H-atom parameters constrained
Δρmax, Δρmin (e Å−3)	1.26, −1.58

Computer programs: Automar (MarXperts, 2015 ▸), iMosflm (Battye et al., 2011 ▸), SHELXS97 and SHELXTL (Sheldrick, 2008 ▸) and SHELXL2014/6 (Sheldrick, 2015 ▸).