We don't have synonyms for tropaeolin yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are tropaeolum and tropeolin.
(n) :
Any of several orange dyes of very complex composition: tropaeolin O (acid orange 6, chrysoine resorcinol), tropaeolin OO (acid orange 5), or tropaeolin OOO (acid orange 7).
(n) :
Any of several orange dyes of very complex composition: tropaeolin O (acid orange 6, chrysoine resorcinol), tropaeolin OO (acid orange 5), or tropaeolin OOO (acid orange 7).