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ABSTRACT: Clitorea ternatea, Acalypha indica, Cissus quadrangularis, Catharanthus roseus and Coleus aromaticus are the plants which are commonly available herbals in Vellore district, Tamil Nadu, India. In the present study, the methanolic leaf extracts of the plants are subjected to Gas chromatography- Mass spectrometry analysis and investigated for the important phytochemical constituents. The GC-MS analysis revealed the presence of 8 major compounds in Clitorea ternatea, 10 major compounds in Acalypha indica, 11 major compounds in Cissus quadrangularis, 9 major compounds in Catharanthus roseus and 5 major compounds in Coleus aromaticus. There were also certain compounds which are commonly available on comparing the phytochemicals. The results of the present comparative study may lead to the invention of new drugs, herbal medABSTRACT: Clitorea ternatea, Acalypha indica, Cissus quadrangularis, Catharanthus roseus and Coleus aromaticus are the plants which are commonly available herbals in Vellore district, Tamil Nadu, India. In the present study, the methanolic leaf extracts of the plants are subjected to Gas chromatography- Mass spectrometry analysis and investigated for the important phytochemical constituents. The GC-MS analysis revealed the presence of 8 major compounds in Clitorea ternatea, 10 major compounds in Acalypha indica, 11 major compounds in Cissus quadrangularis, 9 major compounds in Catharanthus roseus and 5 major compounds in Coleus aromaticus. There were also certain compounds which are commonly available on comparing the phytochemicals. The results of the present comparative study may lead to the invention of new drugs, herbal medicines and in various medical fields for treating several maladies, which may lead to the development of novel drugs using nanotechnology. icines and in various medical fields for treating several maladies, which may lead to the development of novel drugs using nanotechnology.