prov:value
| - ; (2) halogen, such as fluoro, chloro, iodo, and bromo; (3) lower alkyl, such as methyl, ethyl, n-propyl, isopropyl, t-butyl, n-pentyl, and the like groups; (4) lower alkoxy, such as methoxy, ethoxy, isopropoxy, n-butoxy, tentoxy, and the like; (5) hydroxy; alkylhydroxy, alkylethers (6) carboxylic acid or acid salts, such as ???CH2COOH, ???CH2COO???Na+,???CH2CH2COOH, ???CH2CH2COONa, ???CH2CH2CH(Br
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