#define RESD_TYPES_COUNT 21

typedef struct {
    char code3[4];  // three-letter code
    char code1;     // one-letter code
    double color_r;
    double color_g;
    double color_b;
} RESIDUE_TYPE;

RESIDUE_TYPE residue_types[RESD_TYPES_COUNT] = 
{
  {"UNK", 'X', 153/255.0, 153/255.0, 153/255.0},
  {"ALA", 'A', 204/255.0, 255/255.0, 255/255.0},
  {"ARG", 'R', 230/255.0,   6/255.0,   6/255.0},
  {"ASN", 'N', 255/255.0, 153/255.0,   0/255.0},
  {"ASP", 'D', 255/255.0, 204/255.0, 153/255.0},
  {"CYS", 'C',   0/255.0, 255/255.0, 255/255.0},
  {"GLN", 'Q', 255/255.0, 102/255.0,   0/255.0},
  {"GLU", 'E', 255/255.0, 204/255.0,   0/255.0},
  {"GLY", 'G',   0/255.0, 255/255.0,   0/255.0},
  {"HIS", 'H', 255/255.0, 255/255.0, 153/255.0},
  {"ILE", 'I',   0/255.0,   0/255.0, 128/255.0},
  {"LEU", 'L',  51/255.0, 102/255.0, 255/255.0},
  {"LYS", 'K', 198/255.0,   6/255.0,   0/255.0},
  {"MET", 'M', 153/255.0, 204/255.0, 255/255.0},
  {"PHE", 'F',   0/255.0, 204/255.0, 255/255.0},
  {"PRO", 'P', 255/255.0, 255/255.0,   0/255.0},
  {"SER", 'S', 204/255.0, 255/255.0, 153/255.0},
  {"THR", 'T',   0/255.0, 255/255.0, 153/255.0},
  {"TRP", 'W', 204/255.0, 153/255.0, 255/255.0},
  {"TYR", 'Y', 204/255.0, 255/255.0, 204/255.0},
  {"VAL", 'V',   0/255.0,   0/255.0, 255/255.0}
};