Chemical Bank has committed to provide $1.2 billion for American Home Products Corp.'s hostile takeover offer for American Cyanamid Co., and has agreed to use its "best efforts" to raise another $7.8 billion from other banks.

In a regulatory filing this week, American Home said the total cost of the $95-a-share offer, including fees and expenses, would be about $9.2 billion. The tender offer was launched Tuesday.

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