ID Block	Block description	Descriptor list	References	Desc. No.
1	constitutional descriptors			48
2	topological descriptors			119
3	walk and path counts			47
4	connectivity indices			33
5	information indices			47
6	2D autocorrelations			96
7	edge adjacency indices			107
8	Burden eigenvalue descriptors			64
9	topological charge indices			21
10	eigenvalue-based indices			44
11	Randic molecular profiles			41
12	geometrical descriptors			74
13	RDF descriptors			150
14	3D-MoRSE descriptors			160
15	WHIM descriptors			99
16	GETAWAY descriptors			197
17	functional group counts			154
18	atom-centred fragments			120
19	charge descriptors			14
20	molecular properties			29