11-deoxy-11-(carboxy(3,4-dichlorophenethyl)amino)-3-O-(4-methyloxazolidin-2-one-3-yl)carbamoyl-5-O-(3'-N-desmethyl-3'-N-cyclopropylmethyl)desosaminyl-6-O-methylerythronolide A 11,12-(cyclic carbamate)