Midecamycin is a macrolide antibiotic. Synthesized from Streptomyces mycarofaciens. Midecamycin is a macrolide antibiotic. Synthesized from Streptomyces mycarofaciens. Melting point vary depending on the compound type. It may also vary depending on the source consulted. Example: For the A1 type: The Merck Index reports 155-156 Celsius.The Japanese Pharmacopoeia reports 153–158 Celsius. For the A3 type: