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Piperazine series
Product name	CAS NO.	Molecular formula
2-pyrazinecarboxylic acid	98-97-5	C₅H₄N₂O₂
Ethyl pyrazinecarboxylate	6924-68-1	C₇H₈N₂O₂
2-Piperazinecarboxylic acid	2762-32-5	C₅H₁₀N₂O₂
Piperazine-2-carboxylic acid dihydrochloride	133525-05-0	C₅H₁₀N₂O₂.2HCl
Ethyl-2-piperazinecarboxylate	89941-07-1	C₇H₁₄N₂O₂
1,4-bis(n-boc)piperazine-2-carboxylic acid	181955-79-3	C₁₅H₂₆N₂O₆

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