Table 1.

H-bonding parameters (Å, °) for the bisulfate complex of L

D—H ··· O	H ··· O	D ··· O	∠DHO
O1—H1A ··· O20a	1.79(3)	2.573(2)	178(3)
N4—H4 ··· O3b	2.15(3)	2.979(3)	169(2)
N7—H7 ··· O2b	2.12(3)	2.936(3)	171(2)
N18—H18 ··· O1	2.23(2)	2.981(2)	159(2)
N21—H21 ··· O1	2.20(2)	3.020(3)	153(2)
N32—H32 ··· O4a	2.40(2)	3.092(3)	142(2)
N35—H35 ··· O4a	2.06(3)	2.857(3)	170(2)

^a $\frac{1}{2}-\text{x},-\frac{1}{2}+\text{y},\frac{1}{2}-\text{z}$,

^b $\frac{1}{2}-\text{x},\frac{1}{2}+\text{y},\frac{1}{2}-\text{z}$.