a. The heterocyclic compounds shown below are important biological and medicinal drugs/products. Provide one method only to synthesize only the heterocyclic core. i. CI CO.H Fantiazac ii. NH, N. NH, Meo Trimethoprim OMe ii. N NH CO H Histidine a. Show how the heterocycle shown below, could be synthesized from the starting compounds shown. Several steps are required. Show all steps clearly with the reagents needed. i. ? N. N. NH = ZI