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Level 4
C - Cardiovascular systemC02 - AntihypertensivesC02L - Antihypertensives and diuretics in combinationC02LG - Hydrazinophthalazine derivatives and diuretics
C02LG01 - Dihydralazine and diureticsC02LG02 - Hydralazine and diureticsC02LG03 - Picodralazine and diureticsC02LG51 - Dihydralazine, combinations with other drugsC02LG73 - Picodralazine and diuretics, combinations with psycholeptics
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