Supplier Page from Thermo Fisher Scientific for 3-Isopropoxy-4-(tri-n-butylstannyl)-3-cyclobutene-1,2-dione, 97%
1-Ethylpiperidine, 99% from Thermo Fisher Scientific
4-Fluorobenzyl chloride, 98% from Thermo Fisher Scientific
Estrone, 99+% from Thermo Fisher Scientific
Ethyl 3-aminobenzoate, methanesulfonic acid salt, 98% from Thermo Fisher Scientific