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The Merck Index,An Encyclopedia of Chemicals, Drugs, And Biologicals. 13th.ed. Book 2. (2001). New Jersey: Merck Research Lsboratories.

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The Merck Index,An Encyclopedia of Chemicals, Drugs, And Biologicals. 13th.ed. Book 2. 13th. ed. Book2. New Jersey: Merck Research Lsboratories, 2001. Text.