Metabolite Structure Search

Note: "Substructure" uses regex-based pattern matching (not true RDKit subgraph matching).

Limits for substructure search:

• Max 50 characters
• Max 20 atoms
• Max 4 rings
• Max 8 branches

Good for simple patterns like hydroxyl groups (O), methyl (C), phenyl (c1ccccc1). For larger molecules, use "Exact structure" search.