The molecular formula C21H36 (molar mass: 288.52 g/mol, exact mass: 288.2817 u) may refer to:
- Allopregnane, or 5α-Pregnane
- Pregnane, also known as 17β-ethylandrostane
- 5β-Pregnane
The molecular formula C21H36 (molar mass: 288.52 g/mol, exact mass: 288.2817 u) may refer to: