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Table 1 Substituents clustered according to their root atoms

From: Craig plot 2.0: an interactive navigation in the substituent bioisosteric space

R%R—level2%Attached to (%), the * represents any extension
R–C48.1R–C–C9.0N, n (36), C (29), O (16), c (10), X (4), C(=O)* (4)
  R–C(–C)–C4.9C (39), N, n (37), c (11), O (8), C(=O)* (5), X (1)
  R–C(=O)–N3.9C (50), c(34), N, n (13), O (2), C(=O)* (1)
  R–C(=O)–C3.7N, n (76), c (9), O (9), C (6)
  R–C–c2.9N, n (42), C (34), O (10), c (5), C(=O)* (4), X (4)
  R–C–N2.8c (52), C (33), C(=O)* 14
  R–C(–C)–N2.4C(=O)* (53), C (32), c (15)
  R–C(=O)-c2.0N, n (74), C (12), O (7), c (7)
  R–C(–C)-O1.7C (69), c (12), N, n (9), C(=O)* (6), O (4)
  R–C =C1.4c (43), C(=O)* (40), C (12), N, n (3), X (2)
  R–C(–C)–c1.2N, n (71), C (11), c (6), O (6), C(=O)* (5)
  R–C–C–O1.0C (64), c (20). C(=O)* (14)
R–c20.6R–c(:c):c10.9C (42), N, n (21), c (18), C(=O)* (8) O (6), X (5)
  R–c(:n):c5.2C (30), N, n (28), c (22), C(=O)* (13), O (4), X (3)
  R–c(:n):n1.9c (31), C (25), N, n (24), X (15), C(=O)* (4), O (2)
R–N19.6R–N–C8.7C(=O)* (34), C (34), c (32)
  R–N(–C)–C4.7C (42), c (33), C(=O)* (25)
  R-N–c3.1C(=O)* (58), c (28), C (13)
R–O6.1R–O–C4.0c (70), C(=O)* (17), C (14)
  R–O–c1.8C (54), c (41), C(=O)* (5)
R–S3.2R–S–C1.0c (69), C (30)
R–n2.0R–n(:c):c1.1C (71), c (28), C(=O)* (1)
  1. The substituent substructures are shown in SMILES-like notation (atoms in uppercase are aliphatic, in lowercase aromatic, colon is an aromatic bond and the comma between atomic symbols a logical OR). Only substituent classes with more than 1% frequency are shown