Table 2.

Comparison of physical parameters of ritonavir crystal forms

Form	Melting point, °C	ΔHfus, J/g	Solid-state structure
I*	122	78.2	Monoclinic
II*	122	87.8	Orthorhombic
III	78–82	60.3	Monoclinic†
IV	116	59.8	Not assigned
V	97	32.0	Monoclinic†

^*Bauer et al. (8). 

^† Tentative assignment based on PXRD; see text and Fig. 6.