申请人:Biogen MA Inc.
                            
                            
                                公开号:US20170183378A1
                            
                            
                                公开(公告)日:2017-06-29
                            
                            The present invention provides compounds of Formula (I) and (II):
wherein R
1
, R
2
, R
4
, R
5
, R
6
, X and n are as defined herein, and wherein R
3
is hydrogen or a sulfur protecting group. Compounds of Formula (I) and (II), wherein R
3
is hydrogen, may be useful in methods for detecting a reactive metabolite in a sample, e.g., wherein the metabolite is generated from the metabolism of a test compound, and wherein the metabolite and the compound of Formula (I) or (II) react to form a detectable adduct, e.g., detectable by mass spectrometry.