Supplier Page from Thermo Fisher Scientific for Tantalum(V) ethoxide, optical grade, 99.95% (metal basis)
D-Cystine, 98% from Thermo Fisher Scientific
Ethylene carbonate, 99+% from Thermo Fisher Scientific
L-Leucine methyl ester hydrochloride, 98% from Thermo Fisher Scientific
trans-4-Hydroxy-L-proline, 99+% from Thermo Fisher Scientific