Final answer:
There isn't a specified maximum allowable limit for Ethylmorphine to be classified as Schedule III in the DEA guidelines. Similar substances, like codeine, have specific concentration limits for Schedule III classification. For the most accurate and current information, refer to DEA guidelines or legal experts.
Step-by-step explanation:
The control and classification of substances like Ethylmorphine in regards to their permissible limits to be classified as Schedule III is a matter of law, particularly under the Controlled Substances Act in the United States. Schedule III drugs are considered to have a lower potential for abuse than Schedule I and II substances but higher than Schedule IV. Schedule III substances are also recognized for their accepted medical use.
In reference to Ethylmorphine, there isn't a specified maximum allowable limit for this substance to be classified as Schedule III within the publicly available DEA guidelines. However, other related substances and their respective limits are explicitly listed, such as codeine, which is similar in structure and pharmacological effects. For example, preparations containing not more than 1.8 grams of codeine per 100 milliliters or not more than 90 milligrams per dosage unit, with an equal or greater quantity of an isoquinoline alkaloid of opium, can be classified as Schedule III.
The examples provided (c) and (d) relate to concentrations of codeine and iodine in ethanol, respectively, which may be relevant for demonstrating the concept of specific concentration limits but do not directly provide the limits for Ethylmorphine's classification.
It's essential to refer to the current DEA guidelines or consult with legal substances experts for the most accurate and up-to-date information on substance scheduling.