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Abandoned drugs
Alestramustine
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    Alestramustine

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    Alestramustine
    Alestramustine.svg
    Clinical data
    Other names Alanylestramustine; Estradiol 3-(bis(2-chloroethyl)carbamate) 17β-(L-alaninate); Estradiol 3-(bis(2-chloroethyl)carbamate) 17β-(2β-aminopropanoate); Estradiol 3-(bis(2-chloroethyl)carbamate) 17β-((2S)-2-aminopropanoate)
    Drug class Chemotherapeutic agent; Estrogen; Estrogen ester
    Identifiers
    • [(8R,9S,13S,14S,17S)-3-[bis(2-Chloroethyl)carbamoyloxy]-13-methyl-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthren-17-yl] (2S)-2-aminopropanoate
    CAS Number
    PubChem CID
    ChemSpider
    UNII
    ChEMBL
    Chemical and physical data
    Formula C26H36Cl2N2O4
    Molar mass 511.48 g·mol−1
    3D model (JSmol)
    • CC(C(=O)OC1CCC2C1(CCC3C2CCC4=C3C=CC(=C4)OC(=O)N(CCCl)CCCl)C)N
    • InChI=1S/C26H36Cl2N2O4/c1-16(29)24(31)34-23-8-7-22-21-5-3-17-15-18(33-25(32)30(13-11-27)14-12-28)4-6-19(17)20(21)9-10-26(22,23)2/h4,6,15-16,20-23H,3,5,7-14,29H2,1-2H3/t16-,20+,21+,22-,23-,26-/m0/s1
    • Key:NRUFLTXGIPFVSH-KBVRNWHJSA-N

    Alestramustine (INN), also known as estradiol 3-(bis(2-chloroethyl)carbamate) 17β-(L-alaninate), is a cytostatic antineoplastic agent which was never marketed. It is the L-alanine ester of estramustine, which is a combination of the nitrogen mustard normustine coupled via a carbamate to the estrogen estradiol. Alestramustine acts as a prodrug to estramustine, and also forms estradiol as a byproduct. The drug, via its active metabolites, binds to microtubule-associated proteins and β-tubulin and interferes with microtubule function, thereby inhibiting cell division. Due to its estrogen moiety, alestramustine is selectively concentrated in estrogen receptor-positive cells such as prostate and breast.

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