52665-69-7 6S-[6.alpha.(2S*,3S*),8.beta.(R*),9.beta.11. alpha.]-5-(Methylamino)-2-[[3,9,11-trimethyl-8- [1-methyl-2-oxo-2-(1H-pyrrol-2-yl)ethyl]-1,7- dioxaspiro[5,5]undec-2-yl]methyl-4- benzoxazolecarboxylic aci A23187 AIDS-008703 AIDS008703 Calcimycin