Supplier Page from Thermo Fisher Scientific for Triethyl 4-phosphonocrotonate, 92%, predominantly trans
4-Ethylphenol, 97% from Thermo Fisher Scientific
Ethyl 4-bromocrotonate, 75%, tech from Thermo Fisher Scientific
Ethyl oxalyl chloride, 98% from Thermo Fisher Scientific
Ethylmercurithiosalicylic acid, sodium salt, 97.0-101.0% from Thermo Fisher Scientific