发明授权
US5118814A Tetraindolyl-heptamethine derivatives 失效
四氢吡喃衍生物衍生物

Tetraindolyl-heptamethine derivatives
摘要:
Tetraindolyl-heptamethine derivatives of the isomeric formulae ##STR1## in which A, B, D and E denote ##STR2## and may be identical to or different from one another, and the other symbols have the meaning indicated in the description, are used in pressure-sensitive and heat-sensitive recording materials.
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