炭素 たんそ化合 かごう ぶつではありませんでした
tansokagō butsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 炭素化合物

1. Was not a carbon compound.; It was not a carbon compound.

Past/Perfective
Negative
Polite
Formal Register