Sanofi-Aventis SA (SASY.PA) and Genzyme Corp (GENZ.O) have reached an agreement in principle under which Sanofi will acquire Genzyme for $74 a share in cash plus a right to future payments based on the performance of Genzyme's experimental multiple sclerosis drug, according to a source with knowledge of the discussions. The deal is expected to be announced by Wednesday morning, the source said. (Reporting by Toni Clarke, editing by Maureen Bavdek)
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