ポリフェニレンオキシドではありませんでした
porifeniren'okishidodewārimasendeshita

Noun
Desu Copula

The polite, past negative form of ポリフェニレンオキシド

1. Was not polyphenylene oxide.; It was not polyphenylene oxide.

Past/Perfective
Negative
Polite
Formal Register
Chemistry