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All melting points were determined on a Koffler melting point apparatus and are uncorrected. 1 H-NMR and 13 C NMR spectra were recorded on a Bruker avance 400 MHz spectrometer using TMS as internal reference (chemical shifts in , ppm), and IR spectra were obtained on a Nicolet 710 FT-IR spectrometer (KBr, max in cm -1 ). Mass spectra were recorded on a GC-MSQP 1000EX Schimadzu at the Microanalytical laboratory, Cairo University, Cairo, Egypt. Elemental analyses were recorded on Vario El Fab-Nr elemental analyzer (Cairo University). S2. Experimental Procedures General procedure for preparation of ionic liquid Piperidinium acetate-IL:Piperidine (0.9 mL, 0.1 mol) was cooled in an ice bath with continuous stirring then was treated with acetic acid (0.6 g, 0.1 mol) drop-wise through a separating funnel.After reaction completion water vapor was removed under reduced pressure using rotatory evaporator then the product was stored in a vacuum desicator. White solid (13.5

A new series of [1,2,4]-triazole bearing amino acid derivatives were synthesized under green chemistry conditions and evaluated for their antimicrobial activities.