Building block T was prepared in two steps, star7ng with the reac7on of 4-aminobenzyl alcohol with 3,5-bis(trifluoromethyl)phenyl isocyanate to form a urea, followed by the oxida7on of the alcohol group into an aldehyde using MnO2. The reac7on of aldehyde T with 0.5 equiv. of hydrazine hydrate in ethanol with trifluoroace7c acid resulted in symmetrical azine TT in 83% yield. The synthesis of asymmetric azines TA and TB was performed following a similar protocol, using 1 equiv. of each aldehyde and of hydrazine hydrate, to provide a mixture of compounds from which the desired asymmetric azines could be isolated by column chromatography in 35% and 27% yield for TA and TB, respec7vely. Detailed synthe7c procedures and characterisa7on data are provided in the ESI.