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. 2020 Jan 28;8:30. doi: 10.3389/fchem.2020.00030

Figure 2.

Figure 2

Synthesis of piperidine- and piperidinone-based drugs via a nitro-Mannich reaction: (A) the synthesis of CP-99,994; (B) the synthesis of l-(–)-733,061; (C) the synthesis of LP99.