Sun, Wenjie et al. published their research in Zhongguo Yiyao Gongye Zazhi in 2011 | CAS: 87394-48-7

1-(3-Nitropyridin-2-yl)piperazine (cas: 87394-48-7) belongs to piperazine derivatives. Piperazine causes primary dermal irritation and skin burns at high concentrations. Piperazine also causes eye irritation in humans. Two common salts in the form of which piperazine is usually prepared for pharmaceutical or veterinary purposes are the citrate, 3C4H10N2.2C6H8O7 (i.e. containing 3 molecules of piperazine to 2 molecules of citric acid), and the adipate, C4H10N2.C6H10O4 (containing 1 molecule each of piperazine and adipic acid).Formula: C9H12N4O2

Preparation of 1-(5-nitroindolyl-2-carbonyl)-4-[3-(1-methylethylamino)-2-pyridinyl] piperazine was written by Sun, Wenjie;Xiao, Xuhua;Ma, Weiyong. And the article was included in Zhongguo Yiyao Gongye Zazhi in 2011.Formula: C9H12N4O2 This article mentions the following:

5-Nitroindolyl-2-carboxylic acid was converted to the acyl chloride, then the latter was condensed with 1-[3-(1-methylethylamino)-2-pyridinyl]piperazine to prepare 1-(5-nitroindolyl-2-carbonyl)-4-[3-(1-methylethylamino)-2-pyridinyl] piperazine I with an overall yield of about 56%. In the experiment, the researchers used many compounds, for example, 1-(3-Nitropyridin-2-yl)piperazine (cas: 87394-48-7Formula: C9H12N4O2).

1-(3-Nitropyridin-2-yl)piperazine (cas: 87394-48-7) belongs to piperazine derivatives. Piperazine causes primary dermal irritation and skin burns at high concentrations. Piperazine also causes eye irritation in humans. Two common salts in the form of which piperazine is usually prepared for pharmaceutical or veterinary purposes are the citrate, 3C4H10N2.2C6H8O7 (i.e. containing 3 molecules of piperazine to 2 molecules of citric acid), and the adipate, C4H10N2.C6H10O4 (containing 1 molecule each of piperazine and adipic acid).Formula: C9H12N4O2

Referemce:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics