自己 じこ反応 はんのう せい物質 ぶっしつではありませんでした
jikohanno useibusshitsudewārimasendeshita

Noun
Desu Copula

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

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

Past/Perfective
Negative
Polite
Formal Register
Chemistry