| 摘要 |
This invention provides new compounds of formula I, <IMAGE> I wherein X is hydrogen or halogen having an atomic number from 9 to 35 in the 10- or 11-position, and R is a radical of the series OR1, SR2, NR3R4, wherein R1 and R2 are alkyl of 1 to 4 carbon atoms, hydroxyalkyl or aminoalkyl of 2 to 4 carbon atoms, phenyl or phenylalkyl of 7 to 10 carbon atoms in the aggregate thereof, and R3 and R4 are, independently, hydrogen, alkyl of 1 to 4 carbon atoms, phenyl or phenylalkyl of 7 to 10 carbon atoms in the aggregate thereof.
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