*2.2. Cocrystal Screening*

Compounds were prepared by cocrystallization via solvent-drop grinding: Stoichiometric amounts of **DL-H2ma** with **pic**, or **inam** were ground with a mortar and pestle for ca. 5–7 min with the addition of 10 μL of Ethyl acetate per 50 mg of cocrystal formers. The clear, nonsaturated resulting solutions were poured into a 5 mL vial and left to evaporate slowly under ambient conditions until cocrystals formed. The single crystals of (**pic**)-(**D-H2ma) (1**) and (**inam**)-(**L-H2ma) (3**), suitable for X-ray diffraction studies, were obtained in 2–15 days from Ethyl acetate.

Preparation of the cocrystals was also attempted with other solvents, such as dichloromethane, formamide, DMF, chloroform, acetonitrile, isopropyl alcohol, cyclohexane, ethanol, methanol, CCl4, THF and toluene, but the yield was lower.
