Carmustine chemotherapy drug molecule. Computer model of a molecule of carmustine, a chemotherapy drug. Atoms are represented as spheres and are colour-coded: carbon (yellow), hydrogen (white), oxygen (red), nitrogen (blue) and chlorine (green). Carmustine belongs to a family of drugs known as antineoplastics. These drugs control or kill malignant (cancerous) cells by interfering with their DNA (deoxyribonucleic acid). Carmustine is used to treat brain cancers, myelomas, lymphomas and melanoma.