Table 1. Hydrogen-bond geometry (, ).
Cg1 is the centroid of the C18C23 ring.
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N4H4BS1i | 0.91(2) | 2.35(2) | 3.257(2) | 177.1(15) |
| C4H4A Cg1ii | 0.93 | 2.93 | 3.724(2) | 144 |
Symmetry codes: (i) 
; (ii) 
.
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