PT  - JOURNAL ARTICLE
AU  - J S Punzi
AU  - W L Duax
AU  - P Strong
AU  - J F Griffin
AU  - M M Flocco
AU  - D E Zacharias
AU  - H L Carrell
AU  - K D Tew
AU  - J P Glusker
TI  - Molecular conformation of estramustine and two analogues.
DP  - 1992 Mar 01
TA  - Molecular Pharmacology
PG  - 569--576
VI  - 41
IP  - 3
4099  - http://molpharm.aspetjournals.org/content/41/3/569.short
4100  - http://molpharm.aspetjournals.org/content/41/3/569.full
SO  - Mol Pharmacol1992 Mar 01; 41
AB  - The crystal and molecular structures of estramustine and two of its analogues have been determined by X-ray crystallographic techniques (a total of three different compounds). The compounds studied are estramustine [1,3,5(10)-estratriene-3,17 beta-diol-3-N,N-bis(2'- chloroethyl)carbamate] and its monohydrate, estromustine [17-oxo-1,3,5(10)-estratriene-3-yl-N,N-bis(2'-chloroethyl)carbamate], and 17-oxo-5-androsten-3 beta-yl-N,N-bis(2'-chloroethyl)carbamate. Three views of estramustine were obtained from the study of its two crystal forms. The main structural features found are as follows: (a) the geometries of the steroid moieties are closely similar to those of the parent steroids, (b) the bonds around the nitrogen atom of the nitrogen mustard grouping lie approximately in a plane in each structure, (c) the plane through the carbon atoms of the steroid A-ring lies approximately perpendicular to the plane through the carbamate atoms in each structure, (d) the carbonyl C-O of the carbamate points to the alpha side of the steroid moiety in each structure, and (e) one chlorine atom of the nitrogen mustard grouping makes a close contact [3.13 A], in each structure, to the nitrogen atom. Hydrogen bonding to the carbamate appears to occur from the alpha side of the steroid; there is no hydrogen bonding to the nitrogen atom of the carbamate group. These structural data provide some steric explanations for the resistance of the carbamate to enzymatic hydrolysis. The long in vivo half-life of the intact estramustine molecule is a result of this stability. This is responsible for the absence of alkylating ability and the propensity of the drug to bind microtubule-associated proteins and express an antimitotic mechanism of action.