Supplier Page from Thermo Fisher Scientific for Triphenylphosphine dibromide, ca. 33% bromine
2-Mesitylenesulfonyl chloride, 99% from Thermo Fisher Scientific
Benzalkonium chloride, alkyl distribution C8-C16, 50 wt% aqueous solution from Thermo Fisher Scientific
D-Cystine, 98% from Thermo Fisher Scientific
D-Sorbitol, 97% from Thermo Fisher Scientific