Abp-399 [better]

However, if "ABP-399" refers to a different context (e.g., an internal catalog number, a product code, a research document, or a part number in a technical field), please provide additional context, and I would be glad to draft a proper, professional text for that purpose.

ABBV-399 (also commonly known as ABP-399 in research contexts) is a targeted cancer therapy developed by AbbVie. Study Details | NCT03311477 - ClinicalTrials.gov

Is it a:

For example:

Please clarify the intended use, and I will provide a suitable draft.