Simplify the expression. An answer with exponents should contain positive exponents only. 
Definitions:
Milligram
A unit of mass equal to one thousandth of a gram, used in the metric system.
Microgram
A unit of mass in the metric system, equal to one-millionth of a gram.
Milliliters
A unit of volume in the metric system, equal to one thousandth of a liter or about 0.0338 fluid ounces.
Liter
A metric unit of volume equal to 1,000 milliliters or about 0.264 gallons.
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