CB-03-01: What Is It and Is It the Same as Clascoterone?

The short answer

Yes — CB-03-01 is clascoterone. CB-03-01 is the internal development code assigned by the developer, Cassiopea, during preclinical and early clinical work. Clascoterone is the International Nonproprietary Name later assigned to the same molecule.

The naming map

• CB-03-01 — internal development code used throughout early research papers.
• Cortexolone 17α-propionate — the chemical name describing the actual structure.
• Clascoterone — the official generic (INN) name.
• Winlevi — the US brand name of the approved 1% cream for acne.
• Breezula — the brand name used for the androgenetic alopecia development programme.

Why so many names?

Pharmaceutical naming follows a predictable sequence. A compound starts as a laboratory code, acquires a chemical name that describes its structure, is granted a generic INN when it advances clinically, and finally receives a brand name per indication and territory.

This is why older literature discusses CB-03-01 while newer papers discuss clascoterone. The data is continuous; only the label changed.

Why it matters when you research

Searching only for 'clascoterone' will miss the earlier preclinical and Phase I literature filed under CB-03-01 or cortexolone 17α-propionate. If you want the full evidence picture, search all three terms.