芳香ほうこうぞく炭化たんか水素すいそじゃなかったです
hōkōzokutankasuisojanakattadesu

Noun
Desu Copula

The polite, past negative form of 芳香族炭化水素

1. Wasn't aromatic hydrocarbon.

Past/Perfective
Negative
Polite
Casual Register