By Jean-François Labarre

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3 Az 1t 58 1276 1452 1475 21 71 12 9 Q~(CH2) sym. ring. def. AI 7 7 21 ~0 ~0 Assignment Az Q,(CH2) , Q~(CH2) N3P3 ring mode Az ring breathing Az 6~(CH2) a Relative intensity (~) of free MYKO 63, referred to vsC104- (936 cm -1, I = 100). b Decrease in intensity (~); (Ivl (free) -- I"i (bound))/Ivl (free). Figure 26 shows the spectra of free and partially bound N3P3Az6 obtained by the process described above. The spectrum of the bound M Y K O was obtained from the spectrum o f the complex recorded on D a y (D + 6).

9 ~ NaC1 water solution for both toxicity measurements and antitumoral tests; DISOF, having very poor solubility in water, was inoculated as a suspension in 4~oo aqueous hydroxypropylcellulose (Klucel J. F. ). 1 Toxicity The LD o values obtained for the four cyclophosphathiazenes studied are given in Table 9 in which two points are worthy of particular attention: a) SOF and DISOF have the same LD o value, close to that of NaPaAz 6 (LD o = 40 mg/kg)4); thus, the replacement of PAz 2 moiety by a SOF entity does not alter the toxicity within the (NPAz2)a_n(NSOF) .

Table 13. E. of the mean, calculated on the total number of mice per group (a non-tumor-bearing mouse was counted as zero but incorporated into the calculation). 10 only. , 3/4LDo) daily; (ii) Moreover, SOAz exhibits a totally unexpected, exponentially increasing activity-dose relationship for P388 grafted on female D B A / 2 mice. Such a "more than linear" trend is to our knowledge quite unique in cancer chemotherapy: It may happen, for some synergic reasons, when two drugs or more are used in combined therapy but there is no a priori reason to observe such a phenomenon when one drug is used alone.

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Up-to-date improvements in inorganic ring systems as anticancer agents by Jean-François Labarre

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