窒素 ちっそ中毒 ちゅうどくではありませんでした
chissochūdokudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 窒素中毒

1. Was not nitrogen poisoning.; Was not suffering from nitrogen poisoning.

Past/Perfective
Negative
Polite
Formal Register