Carmichaenine B is a benzylisoquinoline alkaloid, specifically a protoberberine derivative, naturally occurring in certain plant species such as those in the Corydalis genus. It is actively researched for its multifaceted bioactive properties in natural product-based drug discovery and ethnopharmacology. Key activities include promising antimicrobial effects against pathogenic bacteria and fungi, supporting its potential in anti-infective therapies; anti-inflammatory and cytotoxic properties, relevant for early-stage cancer treatment; and central nervous system-related effects, such as acetylcholinesterase inhibition, which may aid in developing treatments for Alzheimer's disease and other neurological disorders. Its complex structure also makes it valuable as a synthetic building block or template for novel bioactive molecules in pharmaceutical and phytochemistry applications. Currently, it remains in laboratory research stages without commercial use.