passages.id: split_4_test_591_passage
passages.type: progene_text
passages.text: Analogues 2-6 of N(3),N(6)-bis(2'-myristoyloxyethyl)-1 , 8-dioxotriethylenetetraamine-N,N,N',N'-tetraacetic acid ( BME-DTTA ) ( 1 ) , which like 1 are also based on the DTTA structure but contain shorter fatty acyl chains , were synthesized to improve the water solubility of the corresponding gadolinium complexes .