This product is a mixture of A23187 Magnesium salt CAS 72124-77-7, and A23187 Calcium salt CAS 59450-89-4. These two compounds are mixed as solids.
Many other vendors specify 52665-69-7 as the CAS number of this mixture. Some vendors avoid specifying a CAS number at all. 52665-69-7 belongs to the antibiotic A23187 free acid form, not to any salt of it.
Mixed Calcium-Magnesium salt of A23187 (Calcimycin) is prepared chemically from A23187 (Calcimycin).
Used in cell activation experiments when calcium dose-response data are not required.