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Level 3
R - Respiratory systemR06 - Antihistamines for systemic useR06A - Antihistamines for systemic use
R06AA - Aminoalkyl ethersR06AB - Substituted alkylaminesR06AC - Substituted ethylene diaminesR06AD - Phenothiazine derivativesR06AE - Piperazine derivativesR06AK - Combinations of antihistaminesR06AX - Other antihistamines for systemic use
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