Supplier Page from Aladdin Scientific Corporation for β-Endorphin, human
2-oxa-5,8-diazaspiro[3.5]nonane dihydrochloride from Aladdin Scientific Corporation
4-Bromo-3-nitro-1H-pyrazole-5-carboxylic acid from Aladdin Scientific Corporation
N,N-Diethylmethylamine from Aladdin Scientific Corporation
SH-PEG-COOH from Aladdin Scientific Corporation