Which preposition to use with tropine

with Occurrences 1%

Ladenburg has also formed a series of artificial alkaloids, called tropeines, by uniting the base tropine with different organic acids, as in the case of the compound of mandelic acid and tropine, known as homatropine, an alkaloid of action similar to atropine, but possessing some decided advantages in its use.

Which preposition to use with  tropine