三氯叔丁醇，分子式C₄H₇Cl₃O。

无色、具有樟脑气味、易升华结晶。有半水合物与无水物两种形式。

• 半水物：熔点78°C。微溶于水（1:250），易溶于乙醇（1:1）、乙醚、甘油（1:10）、氯仿和挥发油。
• 无水物：熔点97°C，沸点167°C。易溶于热水，溶于乙醇（1 g/ml）、甘油（0.1 g/ml）、乙醚、丙酮、氯仿、石油醚、冰醋酸、油类。

Chlorobutanol, or trichloro-2-methyl-2-propanol, is a chemical preservative, sedative hypnotic and weak local anaesthetic similar in nature to chloral hydrate. It has antibacterial and antifungal properties. Chlorobutanol is typically used at a concentration of 0.5% where it lends long term stability to multi-ingredient formulations. However, it retains antimicrobial activity at 0.05% in water. In pure state it's a white, volatile solid with a menthol-like odor.