Table 2: Characterisation and toxicity of monensin A.

NameMonensin A, monensic acid
CAS name2-[5-Ethyltetrahydro-5-[tetrahydro-3-methyl-5-[tetrahydro-6-hydroxy-6-(hydroxymethyl)-3,5-dimethyl-2H-pyran-2-yl]-2-furyl]-2-furyl]-9-hydroxy- -methoxy- , ,2,8-tetramethyl-1,6-dioxaspiro[4.5] decane-7-butyric acid
Molecular weight670.87 g/mol
Molecular formulaC36H62O11
CompositionC 64,45%; H 9,32%; O 26,23%
Melting point103–105°C (monohydrate)
Specific rotation[ ]D = +47,7° (methanol)

Toxicity in animals (oral administration of the sodium salt) LD50:
Monkey>160 mg/kg
Rabbit42 mg/kg
Rat29 mg/kg
Cattle26 mg/kg
Swine17 mg/kg
Dog>10 mg/kg