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. 2013 Jun 13;8(6):e66337. doi: 10.1371/journal.pone.0066337

Figure 1. Chemical structures of the C60 fullerene derivatives tested in this study.

Figure 1

The chemical structures of the fullerene derivatives examined in this study are shown. The sources for these structures are described in the Materials and Methods. No. 1, 1,4-dihydro-6,7-dihydroxy [60]fullerenonaphthlene; no. 2, [60]fullerenodicyclopropane-1,1,1′,1′-tetracarboxylic acid; no. 3: [60]fullerenopyrrolidine-2,5-dicarboxylic acid; no. 4, 1-carboxymethyl [60]fullerenopyrrolidine-2,5-dicarboxylic acid; no. 5, 5-isopropyl [60]fullerenopyrrolidine-2-carboxylic acid; no. 6∶1,1,1′,1′-tetramethyl [60]fullerenodipyrrolidinium diiodide; no. 7, [60]fullerenopiperazine-1,4-diacetic acid; no. 8: [60]fullerenotricyclopropane-1,1,1′,1′,1′′,1′′-hexacarboxylic acid; no. 9, 1-ethyl [60]fullerenopyrrolidine-2,5-dicarboxylic acid; no. 10, 1-ethoxycarbonylmethyl [60]fullerenopyrrolidine-2,5-dicarboxylic acid 2-ethyl ester; no. 11, 5-phenyl [60]fullerenopyrrolidine-2-carboxylic acid; and no. 12, 4-(1′-methyl [60]fullerenopyrrolidin-2′-yl)-1-methylpyridinium iodide.