Supplier Page from Thermo Fisher Scientific for Calcium sulfide, 99.9% (metals basis excluding Sr), Sr typically 500 ppm
2-Ethylaniline, 98% from Thermo Fisher Scientific
4'-Fluoroacetophenone, 99% from Thermo Fisher Scientific
Ethyl N-piperazinecarboxylate, 99% from Thermo Fisher Scientific
Ethyl oxalyl chloride, 98% from Thermo Fisher Scientific