Renaming phrases between parenthesis

Hi everybody.

In automator,I want to rename files that look like this:
48_A_LongBass_SP_01 (95a75d93ad1e28dd)
48_A_MoogyBass_SP_01 (6db0f10807ec27c1)…
to:
48_A_LongBass_SP_01
48_A_MoogyBass_SP_01

Every phrases between parenthesis are differents. So how can I tell Automator to remove everything that is between them?

Thank you