Organic compounds are divided into small organic molecules which includes atorvastatin, fluticasone and clopidogrel and biologics which includes insulin, glargine, erythropoietin. Antibodies and hormones, which are proteins, are included and are important organic compounds. Insulin is a very important organic molecule as it is necessary to regulate blood sugar levels in diabetics. Some small molecule drugs can be important as cell signaling molecules, as antiviral drugs or can be taken orally as they can be absorbed through cell membranes. Sometimes organic compounds are extracted from tissues of plants, marine organisms and microorganisms and made into useful drugs. Plants are an excellent source of morphine, digitalis( a heart medicine), quinine, anticancer drugs like Taxol and others. Penicillin is an antibiotic derived from fungi and other antibacterials such as tetracyclines, cephalosporins and others.