こう分子 ぶんし物質 ぶっしつじゃありませんでした
kōbunshibusshitsujārimasendeshita

Noun
Desu Copula

The polite, past negative form of 高分子物質

1. It was not a polymer.; It wasn't a polymer.

Past/Perfective
Negative
Polite
Terminal Form