硫化 りゅうかカドミウムじゃありませんでした
ryūkakadomiumujārimasendeshita

Noun
Desu Copula

The polite, past negative form of 硫化カドミウム

1. Was not cadmium sulfide.; Wasn't cadmium sulfide.

Past/Perfective
Negative
Polite
Terminal Form