Conclusion Melanosis coli is inflammation,benign,reversibility chromatosis as characteristic,the disease is related to taking anthracene for long time constipation.
Dicyano 9,10 dihydro 9,10 ethenoanthracene(4) was synthesized by addition reation of acetylenedinitrile and anthracene. Concave tetrazaporphyrin has been obtained from the four molecules of 4.