2-[(4-Methoxy-2-naphthalenyl)amino]-5-nitrobenzoic Acid selectively inhibits the calcium-activated chloride channel, anoctamin-1. 2-[(4-Methoxy-2-naphthalenyl)amino]-5-nitrobenzoic Acid has potential applications for developing treatments for hypertension, cystic fibrosis, bronchitis, asthma, and hyperalgesia.