Patent ID: 7691884

Claim:
A method of determining levels of β-amyloid in a subject, said method comprising: (i) administering a compound of formula I to said subject, wherein said compound of formula I is of the structure: wherein: R 1 and R 2 are independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, CF 3 , alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cycloalkyl, substituted cycloalkyl, phenyl, substituted phenyl, and (CH 2 ) n (1,3)dioxane; n is 2 to 5; R 3 is selected from the group consisting of hydrogen, alkyl, and substituted alkyl; R 4 is selected from the group consisting of hydrogen, alkyl, substituted alkyl, alkylcycloalkyl, substituted alkylcycloalkyl, phenyl(substituted)alkyl, alkylOH, substituted alkylOH, alkylOBn, substituted alkylOBn, alkylpyridyl, substituted alkylpyridyl, alkylfuranyl, substituted alkylfuranyl, CH(OH)phenyl, CH(OH)substituted phenyl, alkenyl, substituted alkenyl, cycloalkyl, substituted cycloalkyl, N-substituted-piperidinyl, piperidinyl, substituted piperidinyl, tetrahydrothiopyran, substituted tetrahydrothiopyran, 2-indane, substituted 2-indane, phenyl, substituted phenyl, alkylNHR 7 , and substituted alkylNHR 7 ; with the proviso that R 3 and R 4 are not both hydrogen; R 7 is alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, benzyl, substituted benzyl, alkylOH, substituted alkylOH, alkylSR 8 , or substituted alkylSR 8 ; R 8 is alkyl, substituted alkyl, benzyl, or substituted benzyl; or R 3 and R 4 may be joined to form a ring; R 5 is selected from the group consisting of hydrogen, lower alkyl, substituted lower alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, CH 2 cycloalkyl, substituted CH 2 cycloalkyl, beuzyl, substituted benzyl, and CH 2 CH 2 QR 9 ; Q is O, NH or S; R 9 is lower alkyl, substituted lower alkyl, phenyl, or substituted phenyl; R 6 is selected from the group consisting of hydrogen, halogen and CF 3 ; T is selected from the group consisting of W, Y and Z are independently selected from the group consisting of C and CR 10 ; R 10 is selected from the group consisting of hydrogen and halogen, with the proviso that at least one of W, Y and Z must be C; X is selected from the group consisting of S; R 11 is selected from the group consisting of hydrogen, lower alkyl, substituted lower alkyl, benzyl, substituted benzyl, phenyl, and substituted phenyl; provided that when the compound contains one or more chiral centers, at least one of the chiral centers must be of S-stereochemistry; (ii) assaying a sample from said subject.