the platinum compounds cis- [ pt ( nh3 ) 2cl2 ] , [ pt ( en ) cl2 ] , [ pt ( tetrameen ) cl2 ] , cis- [ pt ( nh3 ) 2no2cl ] , and cis- [ ptnh3 ( bz ) cl2 ] at small values of r ( r is the molar ratio of a platinum compound to dna nucleotides in the reaction mixture ) were found to induce an increase in the amplitude of the positive band in the circular dichroic ( cd ) spectrum of linear dna .
C0012854
dna
C0012925
circular