自己 じこ反応 はんのう せい物質 ぶっしつじゃなかったです
jikohanno useibusshitsujanakattadesu

Noun
Desu Copula

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

1. Wasn't self-reactive.; Wasn't a self-reacting substance.

Past/Perfective
Negative
Polite
Casual Register
Chemistry