The present book described the synthesis of some new heterocyclic entities incorporating the active pharmacophores in a single molecular frame work and their biological assessment as new antimicrobial, antiamoebic and anticancer agents. The synthesis of ninety nine novel hetero-cyclic compounds of variegated nature is described in the book using multi-step procedure possessing tetrazoles, pyrazolines, oxadiazoline, pyrimidines and triazines. The detailed synthetic procedures, Biological screening and structural confirmation is briefly explained in the book that will help the readers for...