(b) Any compound, mixture, or preparation containing limited quantities of any of the following narcotic drugs, which shall include one or more non-narcotic active medicinal ingredients in sufficient proportion to confer upon the compound, mixture, or preparation, valuable medicinal qualities other than those possessed by the narcotic drug alone:

1. (1) Not more than 200 milligrams of codeine per 100 milliliter or per 100 grams;
2. (2) Not more than 100 milligrams of dihydrocodeine per 100 milliliters or per 100 grams;
3. (3) Not more than 100 milligrams of ethylmorphine per 100 milliliters or per 100 grams;
4. (4) Not more than 2.5 milligrams of diphenoxylate and not less than 25 micrograms of atropine sulfate per dosage unit;
5. (5) Not more than 100 milligrams of opium per 100 milliliters or per 100 grams.
6. (6) Not more than one-half milligram of difenoxin and not less than twenty-five micrograms of atropine sulfate per dosage unit.