3'-Azetidine-3'-proline-actinomycin ACTINOMYCIN ANALOG AZETIDINE I Actinomycin Az.beta. Actinomycin D, 3(A)(or 3(B))-(2-azetidinecarboxylic acid)- Actinomycin D, 3A-(2-azetidinecarboxylic acid)- Actinomycin D, 3a(or 3b)-(2-acetidinecarboxylic acid)- Azetomycin I NSC 267029 NSC244392