| http://www.w3.org/ns/prov#value | - Agent: 20110105514 - 5,6,7,8-tetrahydro-imidazo[1,5-a]pyrazine compounds: The invention relates to 5,6,7,8-tetrahydro-imidazo[1,5-a]pyrazine derivatives of formula (I) wherein R1, R2, R3, and R4 are as described n the description, to salts, especially pharmaceutically acceptable salts thereof, and to the use of such compounds as medicaments; especially as orexin receptor antagonists....
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