Table 1. Comparative solubility of Pritelivir free and mesylate salt in the different excipients.

Excipient	Saturated solubility (mg ml–1)
	Pritelivir free base	Pritelivir mesylate salt
Water	BLOQ a	1.2
pH 3.5 buffer	0.1 mg	1.3
pH 4.5 buffer	0.1	0.4
pH 5.5 buffer	0.1	0.2
pH 7.0 buffer	0.1	BLOQ a

^aBLOQ: below limit of detection.