Azetidine-2-carboxylic acid (abbreviated Aze) is a plant non-protein amino acid homologue of proline with the molecular formula C4H7NO2. Aze is a heterocyclic, 4 membered ring with nitrogen as its heteroatom (an azetidine), and a carboxylic acid group substituted on one of the ring carbon atoms. The main difference between Aze and proline is the ring of Aze has four members and the ring of proline has five. Aze has the ability to act as an analog of proline and can be incorporated into proteins in place of proline.

CAS：2133-34-8
中文别名：2-吖丁啶羧酸;(S)-(-)-2-羧基环丁胺;L-氮杂环丁烷-2-羧酸;L-三亚甲基亚胺-2-羧酸;(S)-氮杂环丁烷-2-羧酸;
英文别名：(S)-Azetidine-2-carboxylic acid;Azetidyl-2-carboxylic acid;L-Azetidine-2-carboxylic Acid [Antagonist of L-Proline];L-Trimethyleneimine-2-carboxylic acid;(2S)-azetidine-2-carboxylic acid;(S)-(-)-2-Azetidinecarboxylic acid;L-Azetidine-2-carboxylic acid;L-Azetidine-2-carboxylicacid;
分子式：C4H7NO2
分子量：101.104
精确质量：101.048
Psa：49.33
Logp：-0.2383

MDL号：MFCD00005166
PubChem号：24278205
RTECS号：CM4310500
BRN号：80680
EINECS号：218-362-5

外观与性状：米色晶体
密度：1.463 g/cm3
沸点：224ºC
熔点：~215°C (dec.)
闪点：100.1ºC
折射率：-122 ° (C=4, H2O)
水溶解性：5 g/100 mL
稳定性：Stable under normal temperatures and pressures.
储存条件：通风低温干燥
蒸汽压：0.0116mmHg at 25°C

RTECS号：CM4310500
安全说明：S24/25
WGK Germany：3
危险类别码：R36/37/38
海关编码：2933990090
危险品标志：Xi

用途
种子生长抑制剂。L-脯氨酸拮抗剂。