Gravar-mail: Crystal structure of (1RS,21SR,22RS,24SR)-28-oxo-24-propyl-8,11,14-trioxa-24,27-di­aza­penta­cyclo[19.5.1.1(22,26).0(2,7).0(15,20)]octa­cosa-2,4,6,15(20),16,18-hexa­ene acetic acid monosolvate