Profile: Central Drug House (P) Ltd. offers laboratory chemicals and biological stains. We are an ISO 9001:2008 certified company. Our products can be composed of nucleic acids, proteins, or sugars, or a mixture of these elements. Areorganic compounds containing amino group, carboxylic acid group and a side chain that varies between different amino acids. It plays a central role both as building blocks of proteins and as intermediates in metabolism.