Table 1.

Chemical structures of the heterocyclic compounds discussed in this review.

Name	Label	Structure	Heterocycle	Scheme
Nicotinic acid	1.12		pyridine	2,3
Niacin	1.18		pyridine	3
Clarinex	1.22		pyridine	5
Rabeprazole	1.33		pyridine	6,7
Pantoprazole	1.34		pyridine	6,7
Lansoprazole	1.35		pyridine	6,7
Rosiglitazone	1.40		pyridine	8,11
Pioglitazone	1.41		pyridine	12–16
Etoricoxib	1.90		pyridine	17,18
Moxifloxacin	1.102		quinolone	19,20
Levofloxacin	1.103		quinolone	21,22
Nifedipine	2.1		dihydropyridine	23
Amlodipine	2.2		dihydropyridine	24,25
Clevidipine	2.3		dihydropyridine	26
Tiagabine	2.36		piperidine	27
Solifenacin	2.57		piperidine	28
Carmegliptine	2.70		piperidine	30
Lamivudine	3.1		pyrimidine	33
Raltegravir	3.18		pyrimidine	34
Imatinib	3.36		pyrimidine	37,38
Erlotinib	3.37		pyrimidine	39,40
Lapatinib	3.38		pyrimidine	41
Rosuvastatin	3.80		pyrimidine	42,43
Varenicline	4.1		pyrazine	44
Eszopiclone	4.26		pyrazine	45
Brimonidine	4.22		pyrazine	45
Bortezomib	4.27		pyrazine	46
Aplaviroc	4.37		piperazine	47
Azelastine	5.1		pyridazine	48
Cilazapril	5.12		perhydro-pyridazine	49
Lamotrigine	6.1		1,2,4-triazine	50,51
Imiquimod	6.11		imidazoquinoline	52–54
Abacavir	6.37		purine	55
Ocinaplon	6.48		pyrazolo-pyrimidine	56
Zaleplon	6.46		pyrazolo-pyrimidine	57
Indiplon	6.54		pyrazolo-pyrimidine	57
Sildenafil	6.61		pyrazolo-pyrimidone	58–61
Vardenafil	6.87		imidazotriazinone	62–65
Temozolomide	6.105		imidazo-tetrazinone	66–68