こう分子 ぶんし物質 ぶっしつではありませんでした
kōbunshibusshitsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 高分子物質

1. Was not a polymer.; Was not a macromolecule.

Past/Perfective
Negative
Polite
Formal Register