Assertion: cellulose's structure | /r/AtLocation | the ring systems of rosin
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Source sentences:
text: In turn, rosin sizing was identified in the nineteenth and twentieth century papers by a double signal in the range of 1606–1612 cm−1 characteristic of C=C stretching in conjugated structures included in the ring systems of rosin as well as the near 1710 cm−1 signal due to the COOH vibration of abietic acid (Calvini and Gorassini 2002) (paper M1 in Fig. 2).