Table 1.

Chemical formulas, schematic interaction pattern with hinge (magenta), measured pK _a values in water (assignment color‐coded), pdb‐codes and crystallographic resolution of the fragments studied in this contribution.

No.	Chemical formula (hinge to the left, magenta)	pK a values	pdb code	Resolution [Å]
1		<2 >12	6SNX	1.40
2		<2 3.37 >12	5N3H	1.36
3		<2 3.68 >12	5N3Q	1.31
4		<2 8.36 >12	5N3S[a]	1.14
5		9.99 [b]	6Z44	1.38
6		1.33 10.43	5N33	1.43
7		<2 >12	6SPS	1.65
8		<2 3.74 >12	6SPY	1.60
9		<2 3.53 >12	6SOX	1.38
10		4.01	6SNN	1.82
11		3.48	6SPM	1.37
12		3.17 4.56	6SPU	1.39
13		3.20	5N3J	1.12
14		6.91	6Z08	1.49
15		3.05 6.17	5N3E	1.53
16		10.78	5N3D	1.77
17		7.75 >12	6YPS	1.35
18		11.32	5N3C	1.77
19		2.23 10.12	6ZN0	1.59

[a] second orientation with carboxamide to the hinge; [b] value taken from CRC Handbook of Chemistry and Physics. ^[30]