SYNTHESIS OF TETRAKIS-N,N,N-TRIMETHYLAMMONIUMMETHYL-C-3,4-DIMETHOXYPHENYLCALIX[4]RESORCINARENE IODIDE BASED VANILLIN AND ITS ANTIDOTE ACTIVITY FOR CHROMIUM(VI) INTOXICATION - Utomo, Suryadi Budi; Chemical Education Study Program, PMIPA FKIP, Sebelas Maret University, Surakarta (Universitas Gadjah Mada, 2013)