申请人:Tamura Yuusuke
公开号:US20100075957A1
公开(公告)日:2010-03-25
This invention provides a compound of the formula (I):
wherein the ring A is an optionally substituted carbocyclic group or an optionally substituted heterocyclic group; R
1
is optionally substituted lower alkyl, optionally substituted lower alkenyl, optionally substituted lower alkynyl; R
2a
and R
2b
are each independently hydrogen, optionally substituted lower alkyl or optionally substituted acyl; R
3 a
, R
3 b
, R
3 c
and R
3 d
are each independently hydrogen, halogen, hydroxy or optionally substituted lower alkyl etc.;
a pharmaceutically acceptable salt or solvate thereof,
which is useful for treating diseases induced by production, secretion and/or deposition of amyloid β protein.