| http://www.w3.org/ns/prov#value | - H, C1-C6 alkyl, phenyl, and benzyl; [0550] R30 is a bond to Ln; [0551] and a pharmaceutically acceptable salt thereof. [0552] [41] In another more preferred embodiment, the present invention provides a novel ultrasound contrast agent composition, comprising: [0553] (a) a compound of claim 39, comprising: an quinolone that binds to the integrin ??v??3, a surfactant and a linking group between the q
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