よん塩化 えんかケイ けいそではありませんでした
yon'enkakeisodewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 四塩化ケイ素

1. Was not silicon tetrachloride.; Wasn't silicon tetrachloride.

Past/Perfective
Negative
Polite
Formal Register