We don't have synonyms for indan yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are indian, Indian and incan.
(n) :
(organic chemistry) Alternative form of indane. [(organic chemistry, petrochemistry) A bicyclic hydrocarbon consisting of a benzene ring fused to that of cyclopentane; it, and its derivatives, are found in petroleum]
(n) :
(organic chemistry) Alternative form of indane. [(organic chemistry, petrochemistry) A bicyclic hydrocarbon consisting of a benzene ring fused to that of cyclopentane; it, and its derivatives, are found in petroleum]