1-(9H-Fluoren-9-yl)-3-oxo-2,7,10,13,16,19,22,25,28,31,34,37-dodecaoxa-4-azanonatriacontan-39-oic acid

1-(9H-Fluoren-9-yl)-3-oxo-2,7,10,13,16,19,22,25,28,31,34,37-dodecaoxa-4-azanonatriacontan-39-oic acid,