自己 じこ反応 はんのう せい物質 ぶっしつでしょう
jikohanno useibusshitsudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 自己反応性物質

1. Self-reactive substance probably.; It will likely be self-reactive.

Polite
Presumptive
Conjecture
Chemistry