申请人:Faculdade de Ciências da Universidade de Lisboa
公开号:US20180170955A1
公开(公告)日:2018-06-21
A compound of formula I:
or a salt thereof, wherein:
R
1
is —OC(H)(X)(CH
2
)
n
C(═O)OH;
R
2
is —OH, —N
3
, or —N(H)C(═O)CH
3
; or
R
1
and R
2
together with the carbon atoms to which they are attached form
R
3
is —H, —CH
3
, —CH
2
C(═O)OH, or —CH
2
OH;
X is —H, —CH
3
, —CH
2
OH, or CH
2
C(═O)OH; and
n is 0 or 1.