Lorazepam sedative drug, molecular model. Lorazepam is a drug used to treat anxiety or insomnia. It is one of the benzodiazepines, a class of drugs that act as mild tranquillisers on the central nervous system. Lorazepam's chemical formula is C15H10Cl2N2O2. Atoms are represented as spheres and are colour-coded: carbon (C, grey), hydrogen (H, turquoise), chlorine (Cl, green), nitrogen (N, blue) and oxygen (O, red).
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