自己 じこ反応 はんのう せい物質 ぶっしつじゃありませんでした
jikohanno useibusshitsujārimasendeshita

Noun
Desu Copula

The polite, past negative form of 自己反応性物質

1. Was not self-reactive.; Was not a self-reacting substance.

Past/Perfective
Negative
Polite
Terminal Form
Chemistry