1-Carboxymethylpyrrolidone-2 N-(4-methylpiperazide) 1-Methyl-4-((2-oxo-1-pyrrolidinyl)acetyl)piperazine 84762-34-5 BRN 4234345 Piperazine, 1-methyl-4-((2-oxo-1-pyrrolidinyl)acetyl)-