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Level 4
N - Nervous systemN02 - AnalgesicsN02C - Antimigraine preparationsN02CA - Ergot alkaloids
N02CA01 - DihydroergotamineN02CA02 - ErgotamineN02CA04 - MethysergideN02CA07 - LisurideN02CA51 - Dihydroergotamine, combinationsN02CA52 - Ergotamine, combinations excluding psycholepticsN02CA72 - Ergotamine, combinations with psycholeptics
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