Table 1. The polymorphs of TA and INA.

Compound	Form	Synthon	Space group	Stability	Crystallization solvent
TA	α	Carboxyl dimer	P1	Metastable at RT	Chloroform
	β	Carboxyl catemer	P21	Stable at RT	Ethanol
INA	I	Amide catemer	P21/c	Metastable at RT	Nitromethane
	II	Amide dimer	P21/c	Stable at RT	Ethanol, methanol, 2-propanol
	III	Amide catemer	Pbca	Metastable at RT	N/A
	IV	Amide catemer	Pc	Metastable at RT	Nitrobenzene
	V	Amide catemer	P21/c	Metastable at RT	N/A