TNS-3505 Failed to resolve name

On the primary database the current tnsnames.ora config for the db in
question looks like this :

LIVE =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = A.B.C.D)(PORT = 1521))
)
(CONNECT_DATA =
(SID = live)
)
)

This works ok - tnsping etc ...

now when I try to add an entry for <dbname>_PRIMARY or
<dbname>_STANDBY,

LIVE2 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = X.Y.C.D)(PORT = 1521))
)
(CONNECT_DATA =
(SID = live)
)
)

I get a TNS-3505 Failed to resolve name.
I tried various combinations but none worked.

Solution:
After doing lot of comparsion with existing files TNSNAME.ORA , it appeared that nothing is wrong.
Giving the new entry a closer look revealed that minor difference ,a leading whitespace[space on left] exist . Removed that extra space , all worked fine.

Hope it helps