Abstract: The properties of biologically active compounds, for example drugs and agrochemicals, which contain in their molecular structure one or more functional groups selected from alcohol, ether, phenyl, amino, amido, thiol, carboxylic acid and carboxylic acid ester groups are modified by replacing one or more of these functional groups by a lipophilic group selected from those of the formula: RCOO—, RCONH—, RCOS—, RCH2O—, RCH2NH—, —COOCH2R, —CONHCH2R and —SCH2R, wherein R is a lipophilic moiety selected from cis-8-heptadecenyl, trans-8-heptadecenyl, cis-10-nonadecenyl and trans-10-nonadecenyl.

Abstract: The properties of biologically active compounds, for example drugs and agrochemicals, which contain in their molecular structure one or more functional groups selected from alcohol, ether, phenyl, amino, amido, thiol, carboxylic acid and carboxylic acid ester groups are modified by replacing one or more of these functional groups by a lipophilic group selected from those of the formula: RCOO—, RCONH—, RCOS—, RCH2O—, RCH2NH—, —COOCH2R, —CONHCH2R and —SCH2R, wherein R is a lipophilic moiety selected from cis-8-heptadecenyl, trans-8-heptadecenyl, cis-10-nonadecenyl and trans-10-nonadecenyl.

Abstract: The properties of biologically active compounds, for example drugs and agrochemicals, which contain in their molecular structure one or more functional groups selected from alcohol, ether, phenyl, amino, amido, thiol, carboxylic acid and carboxylic acid ester groups are modified by replacing one or more of these functional groups by a lipophilic group selected from those of the formula: RCOO—, RCONH—, RCOS—, RCH 2 O—, RCH 2 NH—, —COOCH 2 R, —CONHCH 2 R and —SCH 2 R, wherein R is a lipophilic moiety selected from cis-8-heptadecenyl, trans-8-heptadecenyl, cis-10-nonadecenyl and trans-10-nonadecenyl.

Abstract: New compounds of the general formula (I): Nu-O-Fa, wherein O represents an oxygen, Nu is a nucleoside or nucleoside analogue, and Fa is an acyl group of a mono-unsaturated C18 or 20 fatty acid. The invention also concerns anti viral pharmaceutical and veterinary compositions comprising a compound of formula (I) alone in a combination with a pharmaceutically acceptable carrier.

Abstract: The invention provides Gemcitabine esters or amides in which the 3′- and/or 5′-OH group and/or the N4-amino group is derivatised with a C18- and/or C20-saturated or mono-unsaturated acyl group, preferably an acyl group selected from oleoyl, elaidoyl, cis-eicosenoyl and trans-eicosenoyl. The Gemcitabine esters and amides are useful as anti-cancer and anti-viral agents.

Abstract: The invention provides Gemcitabine esters or amides in which the 3′- and/or 5′-OH group and/or the N4-amino group is derivatised with a C18- and/or C20-saturated or mono-unsaturated acyl group, preferably an acyl group selected from oleoyl, elaidoyl, cis-eicosenioyl and trans-eicosenoyl. The Gemcitabine esters and amides are useful as anti-cancer and anti-viral agents.

Abstract: wherein R is selected from the group consisting of elaidoyl, cis-eicosenoyl and trans-eicosenoyl; and pharmaceutical compositions comprising the Ara-C derivative.

Abstract: This invention relates to new nucleoside derivatives of formula (I); wherein R1 and R2 are independently selected from hydrogen, elaidoyl, oleoyl, stearoyl, eicosenoyl (cis or trans) and eicosanoyl, with the provisos that R1 and R2 cannot both be hydrogen, oleoyl or stearoyl, R1 cannot be hydrogen when R2 is oleoyl or stearoyl, and R2 cannot be hydrogen when R1 is elaidoyl, oleoyl or stearoyl. Further, the invention relates to the use of the nucleoside derivatives of formula (I) wherein R1 and R2 are independently selected from hydrogen, and C18- and C20-saturated and mono-unsaturated acyl groups, with the provisos that R1 and R2 cannot both be hydrogen, in the manufacture of a pharmaceutical preparation for the treatment of tumours.

Abstract: The properties of biologically active compounds, for example drugs and agrochemicals, which contain in their molecular structure one or more functional groups selected from alcohol, ether, phenyl, amino, amido, thiol, carboxylic acid and carboxylic acid ester groups are modified by replacing one or more of these functional groups by a lipophilic group selected from those of the formula: RCOO—, RCONH—, RCOS—, RCH2O—, RCH2NH—, —COOCH2R, —CONHCH2R and —SCH2R, wherein R is a lipophilic moiety selected from cis-8-heptadecenyl, trans-8-heptadecenyl, cis-10-nonadecenyl and trans-10-nonadecenyl.

Abstract: A monoester compound of formula I:Nu--O--Fawherein O is oxygen, Nu is a nucleoside analog, Fa is an acyl group of a mono-unsaturated C18 or C20 omega-9 fatty acid, which fatty acid is esterified with a hydroxyl group in the 5'-position of the sugar moiety of the nucleoside analog or with a terminal hydroxyl group on the non-cyclic group of the nucleoside analog, and wherein Nu is represented by the formula II:B--Swherein S is a mono-saccharide derivative and B is a heterocyclic ring system.