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In this talk, multiquarks are studied microscopically in a standard quarkmodel. In pure ground-state pentaquarks the short-range interaction is computedand it is shown to be repulsive, a narrow pentaquark cannot be in thegroundstate. As a possible excitation, an additional quark-antiquark pair isthen considered, and this is suggested to produce linear molecular system, witha narrow decay width. This excitation may be energetically favourable to thep-wave excitation suggested by the other pentaquark models. Here, the quarksassemble in three hadronic clusters, and the central hadron provides stability.The possible crypto-heptaquark hadrons with exotic pentaquark flavours arestudied.Comment: 8 pages, 3 tables, talk presented at the International Workshop  PENTAQUARK04 July 20-23, 2004, SPring-8, Japa

EXOTIC PENTAQUARKS, CRYPTO-HEPTAQUARKS AND LINEAR THREE-HADRONIC MOLECULES