飽和 ほうわ炭化 たんか水素 すいそでしょう
fuhō watanka suisodeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 不飽和炭化水素

1. Unsaturated hydrocarbon, likely.; Possibly an unsaturated hydrocarbon.

Polite
Presumptive
Conjecture