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Ar is 1,2-, 1,3-, or 1,4-phenylene optionally substituted with one, two, or three groups of (C 1 -C 6 ) alkyl, (C1-C5) alkoxy, (C1-C4) thioalkoxy, halogen, nitro, COOR', -CONHR, -O(CH 2 ) n COOR, -S(CH 2 ) n COOR, -O(CH 2 ) n CONHR', or -S(CH 2 ) n CONHR' wherein n and R are as hereinbefore defined, or Ar is a 1,2-, 1,3-, 1,4-, 1,5-, 1,6-, 1,7-, 1,8-, 2,3-, 2,6-, or 2,7-naphthylidene each optionally substituted with one, two, three, or four groups of (C 1 -C 6 ) alkyl, (C1-C5) alkoxy, (C1-C4) thioalk Z 1 is (C 1 -C 5 ) alkyl, or phenyl optionally substituted with one, two, or three groups of (C1-C5) alkyl, (C1-C4) alkoxy, (C1-C4) thioalkoxy, halogen, nitro,COOR, CONHR', -O(CH 2 ) n COOR, -S(CH 2 ) n COOR, -O(CH 2 ) n CONHR, or -S(CH 2 ) n CONHR'

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Nationwide ground-level ozone measurements in China suggest serious risks to forests