Too bad that benzoyltropine has phamacological properties like atropine rather then cocaine. You can't just cut off the -COOCH3 and expect the molecule to still have the same effect. But that might actually not the main problem. The OH in tropine from atropine is alpha, while the one in ecgonine is beta. Pseudotropine would be the tropine analogue of ecgonine, the tropacocaine the name of benzoyl pseudotropine.
Two useful refs: Medline (PMID=2417262) (http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2417262&dopt=Abstract)
and Medline (PMID=1974643) (http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1974643&dopt=Abstract)
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