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Level 3
M - Musculo-Skeletal System
M03 - Muscle Relaxants
M03B - Muscle Relaxants, Centrally Acting Agents
M03BA - Carbamic acid esters
M03BB - Oxazol, thiazine, and triazine derivatives
M03BC - Ethers, chemically close to antihistamines
M03BX - Other centrally acting agents
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