the following is th struture of Carbomycin also known commercially as Magnamycin which is an antibiotic very effective against the same basteria as penicillin. Magnamycin has the advantage of also being effective against some parasites that are responsable for many diseases such as tifoidea.
a. indicate (with an asterisc) the stereogenic carbons that it has, if any
b. indicate the number of stereoisomers possible