Abstract: Disclosed herein are methods of diagnosing a disease or condition associated with abnormal platelet activation in a subject. Also disclosed herein are methods for assessing the propensity of donor platelets to release an uptaken fluorescent false neurotransmitter (FFN).

Abstract: The present invention provides a compound having the structure: wherein X1 is H or alkyl; Y1 is H, -alkyl, -alkenyl, -alkynyl, alkylaryl, -cycloalkyl, -aryl, heteroaryl, -alkyl-Y3 or -alkyl-C(O)Y4, and Y2 is H, -alkyl, -alkenyl, -alkynyl, alkylaryl, -cycloalkyl, -aryl, heteroaryl, -alkyl-Y3 or -alkyl-C(O)Y4, wherein each Y3 is, independently, —OH, -O(alkyl), —NH2, -NH(alkyl) or halogen, and each Y4 is, independently, —OH, -O(alkyl), —NH2, -NH(alkyl) or -N(alkyl)2; Z1 is H, -alkyl, -alkenyl, -alkynyl, alkylaryl, -aryl, heteroaryl, -alkyl-Z3 or -alkyl-C(O)Z4, and Z2 is H, -alkyl, -alkenyl, -alkynyl, alkylaryl, -aryl, heteroaryl, -alkyl-Z3 or -alkyl-C(O)Z4, wherein each Z3 is, independently, —OH, -O(alkyl), —NH2, -NH(alkyl) or halogen, and each Z4 is, independently, —OH, -O(alkyl), —NH2, -NH(alkyl) or -N(alkyl)2; R1, R2, R3 and R4 are each, independently, —H, —F, —Cl, —Br, —I, —NO2, —CN, —CF3, —CF2H, —OCF3, -(alkyl), -(alkenyl), -(alkynyl), -(aryl), -(heteroaryl), —OH, —OAc, -O-(alkyl), -O-(alkenyl),