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(1S,2S)-(-)-1,2-Diphenylethylenediamine
1,3-Bis(2,4,6-trimethylphenyl)imidazol-2-ylidene
meso-Tetra(4-carboxyphenyl)porphine
1,3-Bis(2,6-di-i-propylphenyl)imidazolium chloride
(+)-2,2'-Methylenebis[(3AR,8AS)-3A,8A-Dihydro-8H-Indeno[1,2-D]Oxazole]
2,6-Bis[(3aR,8aS)-(+)-8H-indeno[1,2-d]oxazolin-2-yl)pyridine
2,2'-Bipyridine
(1S,2S)-(+)-1,2-Diaminocyclohexane
(-)-2,2'-Methylenebis[(3AS,8AR)-3A,8A-Dihydro-8H-Indeno[1,2-D]Oxazole]
(1R,2R)-(-)-N-(4-toluenesulfonyl)-1,2-diphenylethylenediamine
1,3-Bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazol-2-ylidene
meso-Tetraphenylporphine (contains 1-3% chlorin)