せん したそうだ
senjidashita sōda

Godan Verb (su)
Evidential Auxiliary

Expresses hearsay about a past event ("I heard that...") of 煎じ出す

1. It is said that [someone] figured out.; It is said that [someone] extracted.; It is said that [someone] determined.

Past/Perfective
Hearsay Evidence