Max Planck Society and the American Chemical Society (ACS) came into a new transformative agreement which will facilitate 100% of Max Planck Society research articles to be published Open Access in ACS journals enabling - simultaneously- the Max Planck Digital Library to immediately shift its own investments from supporting paywalls to supporting Open Access research dissemination.

At this link the full ACS press release.  In the ESAC website page - "Transformative Agreement Registry " - they are available further details of this new agreement.

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