A compound corresponds in structure to structural Formula V, wherein -A is -H (hydrido) or -C NH-R 4; R 1, R 2, R 3 and R 4 are the same or different and are a 2-(4-fluorophenyl)ethyl, a trans-2-phenylcyclopropyl, a trans-2-(4-fluorophenyl)-cyclopropyl or a C 3 -C 18 hydrocarbyl group with the provisos that: 1) at least two of R 1, R 2, R 3 and R 4 (R 1-4) or at least two of R 1, R 2, and R 3 (R 1-3) are a trans-2-phenylcyclopropyl, a trans-2-(4-fluorophenyl)-cyclopropyl group or a mixture thereof, or each of R 1-4 is a 2-(4-fluorophenyl)ethyl group, 2) at least one depicted pyrrolidinyldi-carboxamido group has the (S,S) configuration, and each depicted R substituent other than a C 3 -C 18 hydrocarbyl group is a trans-2-phenylcyclopropyl, a trans-2-(4-fluorophenyl)cyclopropyl group or a mixture thereof when each of R 1-4 is other than 2-(4-fluorophenyl)-ethyl, 3) no more than two of R 1-4 are C 8 -C 18 hydrocarbyl groups when -A is -C NH-R 4, and 4) when A is hydrido, one of R 1-3 can be a C 8 -C 18 hydrocarbyl group and the depicted R 3 -containing pyrrolidinylcarboxamido group can have either the R or S configurations, or a mixture of both configurations; -Z is one or more of halogen -H, -NH 2, -OH, -OCH 3, -NO 2, -OCH 2 CO 2 H, -O(CH 2 CH 2 0) n CH 2 CH 2 CO 2 H, -OCH 2 CONH(CH 2 CH 2 O) n CH 2 CH 2 CO 2 H, -NHCOCH 2 O-(CH 2 CH 2 O) n CH 2 CO 2 H, -OCH 2 CONHCH 2 CONHCH(CHOH)CO 2 H, -OCH 2 CONHCH 2 CONHCHCO 2 H(CH 2 CO 2 H), -OCH 2 CONHCH 2 CONHCH(CHOH) (CH 2 CH 2 O) n CH 2 CH 2 CO 2 H, -OCH 2 CONHCH 2 CONHCH[(CH 2) 4 NH 2]CO 2 H, -OCH 2 CONHCH 2 CONHCH(CH 2 OH)CO{NHCH[(CH 2) 4 NH 2]CO} m NHCH-[(CH 2) 4 NH 2]CO 2 H (SEQ ID NOs: 3-8), -OCH 2 CONHCH 2 CO{NHCH[(CH 2) 4 NH 2]CO} p NHCH[(CH 2) 4 NH 2]CO 2 H (SEQ ID NOs: 9-13) and -OCH 2 CONHCH 2 CO{NHCH(CH 2 OH)CO} q NHCH(CH 2 OH)CO 2 H (SEQ ID NOs: 14-18); W is nitrogen or CH; "n" is a number whose average value is one to eight; "m" is a number whose value is 1 to 6; "p" is a number whose value is 1 to 6; and "q" is a number whose value is 1 to 6. -A is -H (hydrido) or -C NH-R 4; R 1, R 2, R 3 and R 4 are the same or different and are a 2-(4-fluorophenyl)ethyl, a trans-2-phenylcyclopropyl, a trans-2-(4-fluorophenyl)-cyclopropyl or a C 3 -C 18 hydrocarbyl group with the provisos that: 1) at least two of R 1, R 2, R 3 and R 4 (R 1-4) or at least two of R 1, R 2, and R 3 (R 1-3) are a trans-2-phenylcyclopropyl, a trans-2-(4-fluorophenyl)-cyclopropyl group or a mixture thereof, or each of R 1-4 is a 2-(4-fluorophenyl)ethyl group, 2) at least one depicted pyrrolidinyldi-carboxamido group has the (S,S) configuration, and each depicted R substituent other than a C 3 -C 18 hydrocarbyl group is a trans-2-phenylcyclopropyl, a trans-2-(4-fluorophenyl)cyclopropyl group or a mixture thereof when each of R 1-4 is other than 2-(4-fluorophenyl)-ethyl, 3) no more than two of R 1-4 are C 8 -C 18 hydrocarbyl groups when -A is -C NH-R 4, and 4) when A is hydrido, one of R 1-3 can be a C 8 -C 18 hydrocarbyl group and the depicted R 3 -containing pyrrolidinylcarboxamido group can have either the R or S configurations, or a mixture of both configurations; 1) at least two of R 1, R 2, R 3 and R 4 (R 1-4) or at least two of R 1, R 2, and R 3 (R 1-3) are a trans-2-phenylcyclopropyl, a trans-2-(4-fluorophenyl)-cyclopropyl group or a mixture thereof, or each of R 1-4 is a 2-(4-fluorophenyl)ethyl group, 2) at least one depicted pyrrolidinyldi-carboxamido group has the (S,S) configuration, and each depicted R substituent other than a C 3 -C 18 hydrocarbyl group is a trans-2-phenylcyclopropyl, a trans-2-(4-fluorophenyl)cyclopropyl group or a mixture thereof when each of R 1-4 is other than 2-(4-fluorophenyl)-ethyl, 3) no more than two of R 1-4 are C 8 -C 18 hydrocarbyl groups when -A is -C NH-R 4, and 4) when A is hydrido, one of R 1-3 can be a C 8 -C 18 hydrocarbyl group and the depicted R 3 -containing pyrrolidinylcarboxamido group can have either the R or S configurations, or a mixture of both configurations; -Z is one or more of halogen -H, -NH 2, -OH, -OCH 3, -NO 2, -OCH 2 CO 2 H, -O(CH 2 CH 2 0) n CH 2 CH 2 CO 2 H, -OCH 2 CONH(CH 2 CH 2 O) n CH 2 CH 2 CO 2 H, -NHCOCH 2 O-(CH 2 CH 2 O) n CH 2 CO 2 H, -OCH 2 CONHCH 2 CONHCH(CHOH)CO 2 H, -OCH 2 CONHCH 2 CONHCHCO 2 H(CH 2 CO 2 H), -OCH 2 CONHCH 2 CONHCH(CHOH) (CH 2 CH 2 O) n CH 2 CH 2 CO 2 H, -OCH 2 CONHCH 2 CONHCH[(CH 2) 4 NH 2]CO 2 H, -OCH 2 CONHCH 2 CONHCH(CH 2 OH)CO{NHCH[(CH 2) 4 NH 2]CO} m NHCH-[(CH 2) 4 NH 2]CO 2 H (SEQ ID NOs: 3-8), -OCH 2 CONHCH 2 CO{NHCH[(CH 2) 4 NH 2]CO} p NHCH[(CH 2) 4 NH 2]CO 2 H (SEQ ID NOs: 9-13) and -OCH 2 CONHCH 2 CO{NHCH(CH 2 OH)CO} q NHCH(CH 2 OH)CO 2 H (SEQ ID NOs: 14-18); W is nitrogen or CH; "n" is a number whose average value is one to eight; "m" is a number whose value is 1 to 6; "p" is a number whose value is 1 to 6; and "q" is a number whose value is 1 to 6.