Correction: Döring et al. Discovery of Novel Symmetrical 1,4-Dihydropyridines as Inhibitors of Multidrug-Resistant Protein (MRP4) Efflux Pump for Anticancer Therapy. Molecules 2021, 26, 18.

The authors would like to correct an error made through no fault of their own in the title paper [...].

The authors would like to correct an error made through no fault of their own in the title paper [1]. The error is related to the FAR values in Table 1. In the earlier published version, the FAR values of compounds 15–21 were wrongly printed. So, they had to be corrected, from 1.19 to 1.12 for 15, 1.55 to 1.19 for 16, 0.95 to 1.55 for 17, 1.22 to 0.95 for 18, 0.98 to 1.22 for 19, 1.30 to 0.98 for 20 and 0.82 to 1.30 for 21. We provide below the corrected Table 1. The change has no influence on the reported results. The original article has been updated. The authors would like to apologize for any inconvenience caused to the readers by this change.

Table 1

MRP4 inhibition data of target compounds 4–21 with varied substitution patterns expressed as FAR values.

Compound	R1	R2	R3	R4	FAR
Value [a]
4	CF3	H	CF3	H	1.28
5	CF3	H	OMe	H	1.21
6	CF3	H	H	OMe	1.11
7	CF3	H	OMe	OMe	1.10
8	H	CF3	OMe	H	1.28
9	H	CF3	H	OMe	1.11
10	H	CF3	OMe	OMe	1.26
11	F	F	OMe	H	1.43
12	F	F	H	OMe	1.40
13	F	F	OMe	OMe	1.23
14	F	H	OMe	OMe	1.21
15	H	F	OMe	OMe	1.12
16	CF3	OMe	CF3	H	1.19
17	CF3	OMe	OMe	H	1.55
18	CF3	OMe	H	OMe	0.95
19	CF3	OMe	OMe	OMe	1.22
20	OMe	OMe	CF3	H	0.98
21	OBn	OBn	CF3	H	1.30

[a] Fluorescence activity ratio as mean of three determinations.