資産 しさん担保 たんぽ証券 しょうけんではありませんでした
shisantamposhōkendewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 資産担保証券

1. Was not an asset-backed security.; Was not a collateralized debt obligation.

Past/Perfective
Negative
Polite
Formal Register