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Table 2 Selected normalized letter frequencies for various positions (1 to 14) in the InChIKey first block

From: InChIKey collision resistance: an experimental testing

Position 1 2 3 4 5 6 7 12 13 14
A 1.0000 0.9221 0.9130 0.9917 0.9213 0.9227 1.0039   0.9250 1.2273 0.9390
D 0.9898 0.9223 0.9182 1.0038 0.9138 0.9260 0.9938 0.9291 1.2321 0.9380
E 0.0000 0.9164 0.9331 0.0000 0.9208 0.9256 0.0000 0.9216 1.2249 0.9436
F 0.9986 0.9145 0.9200 0.9964 0.9183 0.9283 0.9957 0.9171 1.2313 0.9430
R 0.9965 0.9109 0.9279 1.0015 0.9207 0.9269 0.9916 0.9213 1.2152 0.9420
S 0.9940 0.9186 0.9294 0.9956 0.9184 0.9259 0.9957 0.9226 1.2236 0.8924
T 0.2395 0.9237 0.9303 0.2351 0.9227 0.9291 0.2297 0.9268 0.8413 0.9037
U 0.9992 0.9573 0.9341 0.9934 0.9543 0.9303 0.9906 0.9251 0.0000 0.8902
 
Z 0.9986 0.9627 0.9293 0.9969 0.9569 0.9288 0.9873 0.9316 0.0000 0.8857
  1. Measured using InChIKeys for 998753 isomers of C9H8O1; the values are normalized to the frequency of ‘A’.