((3,4,5-Trihydroxyphenyl)methylene)propanedinitrile (3,4,5-Trihydroxybenzylidene)-malononitrile 118409-58-8 NSC 676484 Propanedinitrile, ((3,4,5-trihydroxyphenyl)methylene)- Tyrphostin 25 Tyrphostin A25 Tyrphostin-25