芳香 ほうこう ぞく炭化 たんか水素 すいそでしょう
hōkōzokutankasuisodeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 芳香族炭化水素

1. Aromatic hydrocarbon, likely.; Probably an aromatic hydrocarbon.

Polite
Presumptive
Conjecture