ナフテンけい炭化たんか水素すいそじゃなかったです
nafutenkeitankasuisojanakattadesu

Noun
Desu Copula

The polite, past negative form of ナフテン系炭化水素

1. Wasn't naphthenic hydrocarbon.

Past/Perfective
Negative
Polite
Casual Register