C16H21N3O2 explained

The molecular formula C₁₆H₂₁N₃O₂ may refer to:

• Zolmitriptan, a triptan used in the acute treatment of migraine attacks
• Cyanopindolol, a drug related to pindolol which acts as both a β1 adrenoceptor antagonist and a 5-HT1A receptor antagonist