石炭 せきたん さん樹脂 じゅしじゃなかったです
sekitansanjushijanakattadesu

Noun
Desu Copula

The polite, past negative form of 石炭酸樹脂

1. It wasn't rosin.; It wasn't coal tar resin.

Past/Perfective
Negative
Polite
Casual Register