Identify an antiseptic compound from following.

Antiseptics are chemical substances applied to living tissues to kill or inhibit microbial growth, preventing infection. Assessing the options:

Salvarsan is an arsenic-based chemotherapeutic agent for syphilis treatment, not an antiseptic. Thymol exhibits antiseptic and antifungal properties, commonly used in mouthwashes and topical applications. Sulphanilamide and chloramphenicol are systemic antibacterial antibiotics rather than antiseptics.

Given these pharmacological classifications, thymol qualifies as the antiseptic compound.