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. 2020 May 27;151:105386. doi: 10.1016/j.ejps.2020.105386

Table 3.

ADME-related physicochemical parameters, pharmacokinetic properties, and metabolic reactions predicted for benzothiazole 12.

PHYSICOCHEMICAL
logPa pKab Swc DiffCd MolVole MDCKf Peffg Skinh Corneai BBBj logBBk
4.23 3.73 4.79 8.29 266 5.45 4.90 1.25 1.48 High 0.15
PHARMACOKINETIC
Hum_fupl RBPm Vdn ECCSo CL_Metbp CL_Renalq CL_Uptaker
1.06% 0.12 0.31 Class 2 Yes (99%) No (95%) No (99%)
METABOLISM
Phase 1. Oxidations CYP1A2 CYP2A6 CYP2B6 CYP2C8 CYP2C9 CYP2C19 CYP2D6 CYP2E1 CYP3A4
Substratet Yes Yes Yes Yes No No Yes No Yes
Confidenceu 88% 60% 55% 79% 81% 98% 82% 97% 83%
Kmv 23.02 - - - - - 63.02 - 55.73
Vmaxw 7.10 - - - - - 3.48 - 0.41
CLintx 16.04 - - - - - 0.44 - 0.82
Phase 2. Glucuronidationy UGT1A1 UGT1A3 UGT1A4 UGT1A6 UGT1A8 UGT1A9 UGT1A10 UGT2B7 UGT2B15
Substratet Yes No No No Yes Yes No No No
Confidenceu 90% 51% 72% 75% 87% 88% 86% 56% 98%
a

logP: octanol-water partition coefficient (lipophilicity)

b

pKa: dissociation constant using submodels to predict protic ionization microconstants for all identified ionizable groups in a molecule.

c

Sw (mg/mL×10−4): native water solubility.

d

DiffC (cm2/s×106): molecular diffusion coefficient in water

e

MolVol (cm3/mol): molal volume at the normal boiling point

f

MDCK (cm2/s×105): apparent MDCK COS permeability

g

Peff (cm2/s×104): human effective jejunal permeability

h

Skin (cm2/s×105): permeability through human skin

i

Cornea (cm2/s×105): permeability through rabbit cornea

j

BBB: qualitative likelihood (High/Low) of crossing the blood-brain barrier (98% confidence)

k

logBB: logarithm of the brain/blood partition coefficient.

l

Hum_fup: percent unbound to blood plasma proteins in human.

m

RBP: blood-to-plasma concentration ratio in human.

n

Vd (L/kg): volume of distribution in humans at steady state.

o

ECCS Class: Extended Clearance Classification System (ECCS) assignment

p

CL_Metab: predicts whether or not metabolism will be critical to clearance

q

CL_Renal: predicts whether or not renal elimination will be critical to clearance.

r

CL_Uptake: predicts whether or not hepatic uptake will be critical to clearance.

s

Most common chemical reaction of Phase 1 of metabolism (oxidation) by Cytochromes P450 (CYP) enzymes

t

Substrate: substrate classification models (yes/no) for human CYPxxx or UGTxxx

u

Confidence of predictions

v

Km (μM): estimated Michaelis-Menten Km constant for predicted sites of metabolism by human CYPxxx

w

Vmax: [nmol/min/nmol enzyme]: estimated Michaelis-Menten Vmax constant for predicted sites of metabolism by CYPxxx

x

CLint (μL/min/mg human liver microsomes (HLM) protein): estimated intrinsic clearance for predicted sites of metabolism by CYPxxx

y

Most common chemical reaction of Phase 2 of metabolism (glucuronidation) by uridine 5′-diphospho-glucuronosyltransferase (UGT)