酸化 さんか防止 ぼうし ざいじゃなかったです
sankabōshizaijanakattadesu

Noun
Desu Copula

The polite, past negative form of 酸化防止剤

1. Wasn't an antioxidant.; It wasn't an antioxidant.

Past/Perfective
Negative
Polite
Casual Register