This part of the title refers to a specific class of compounds. Pyrazinones are organic compounds that contain a pyrazine ring. The "2(1H)" designation indicates the position of the hydrogen atom on the pyrazine ring.
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3-(3-butynyloxy)-5-chloro-6-methyl-1-phenyl-2(1H)-pyrazinone
5-chloro-3-methoxy-6-methyl-1-phenyl-pyrazin-2(1H)-one
