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1. AA benzisoxazole core linked via a central carbon to a piperidine ring, as seen in risperidone
2. BA diphenylbutylpiperidine side chain conferring very long half-life
3. CA tricyclic ring system with sulfur and nitrogen atoms bridging two benzene rings
4. DA dibenzodiazepine ring fused with a piperazine side chain
5. EA four-ring fluorinated structure derived from diphenylbutylpiperidine